All art is a blend of form and content; and it is through certain excellences characterising either, that the artist succeeds in inducing in us the artistic attitude. In the case of poetry, for example, the content is constituted by the figurative ideas, and sentiments it expresses : and the form, by the musical language through which they find expression. Of these, the form varies much from one art to another; and it is also technical. We shall not refer to it here at any length, and shall confine our attention mainly to the content. We shall only observe, in passing, that the legitimate function of form is to subserve the content; and if it assumes greater importance, the work in which it does so marks a lapse from the best type of art. The content of art may be defined generally as the meaning which it expresses. The excellences that may characterize it are many, and they have been classified in various ways.

The question tests comprehension of the passage regarding what constitutes the content of poetry. Let’s go through the steps to identify the correct answer:

1. Understand the Passage: The passage highlights that art comprises both form and content. Specifically for poetry, it mentions that:
   • The content of poetry is made up of "figurative ideas" and "sentiments it expresses".
   • The form of poetry is through "musical language".
2. Analyze the Answer Options:
   • Option (a) - "Only (a) and (b)": This suggests that figurative ideas and musical language are the content, which does not align with the passage. Thus, this option is incorrect.
   • Option (b) - "Only (a) and (c)": This states that figurative ideas and sentiments make up the content. This aligns perfectly with the passage.
   • Option (c) - "Only (b) and (c)": This proposes musical language and sentiments as the content. While sentiments are mentioned, musical language pertains to form, not content. Hence, this option is incorrect.
   • Option (d) - "Only (b)": This claims that musical language alone constitutes the content, which contradicts the passage since it is related to form, not content.
3. Conclusion: The correct answer is option "Only (a) and (c)", meaning the content of poetry includes figurative ideas and the sentiments it expresses.

To solve this question, we need to match the given options with the definitions and context provided in the passage regarding the form of poetry.

1. Option (a): Form doesn't vary from one art to another
   According to the passage, form does vary from one art to another. This means that Option (a) is incorrect.
2. Option (b): Form is technical
   The passage explicitly states that form is technical. Therefore, Option (b) is correct.
3. Option (c): Form is figurative
   The passage describes the content as being made up of figurative ideas and sentiments, not the form. Hence, Option (c) is incorrect.
4. Option (d): Form constitutes musical language
   As per the passage, in poetry, the form is described by the musical language through which ideas and sentiments find expression. Therefore, Option (d) is correct.

Combining the correct options, we find that both Option (b) and Option (d) are correct according to the passage.

Therefore, the correct choice is: Only (b) and (d).

The question tests your understanding of the relationship between form and content in art, particularly focusing on their function. The statement provided in the comprehension passage describes the interaction between form and content in art.

1. Understanding the Context: The passage explains that in any art form, be it poetry or visual arts, there are two essential components:
   • Form: This is the technical or aesthetic structure in which the art is presented, such as musical language in poetry.
   • Content: This refers to the meaning, ideas, or sentiments expressed through the art.
2. Analyzing the Function of Form:
   • The passage succinctly states, "the legitimate function of form is to subserve the content."
   • To "subserve" means to serve as a subordinate or to be used for a particular purpose.
   • Thus, in art, form is meant to enhance, support, and effectively convey the content.
   • If the form overshadows the content, it is considered a deviation from the ideal artistic expression.
3. Correct Option Justification:
   • The option "To subserve the content" is the correct answer because it aligns with the described legitimate relationship between form and content as outlined in the passage.
   • Other options such as "To obverse the content," "To reject the content," and "To subsume the content" do not align with the idea of form serving the purpose of content.

In conclusion, the correct answer is that the legitimate function of form is To subserve the content.