The question asks us to rearrange five sentences (A, B, C, D, E) into a coherent paragraph and identify the second sentence in the sequence. Let's analyze each sentence:

• A. We breathe polluted air, drink polluted water and eat polluted food. (Gives specific examples of pollution's impact).
• B. Rising pollution is a very big problem for us. (Introduces the main topic - pollution as a problem).
• C. The question is rising how can we protect ourselves from this enemy. (Poses a question about solutions, likely appearing towards the end).
• D. It is producing health challenges for all. (States a consequence of pollution, referring back to the problem).
• E. Pollution produces many health challenges not only for all creatures but also for our environment. (Expands on the health challenges and scope of impact).

Rearranging the Sentences for a Logical Flow

To create a meaningful paragraph, we need to establish a logical order:

1. First Sentence: Sentence B, "Rising pollution is a very big problem for us," serves as the best opening statement. It introduces the central theme clearly.
2. Second Sentence: Sentence D, "It is producing health challenges for all," logically follows sentence B. The pronoun "It" directly refers to "Rising pollution," explaining a major consequence of this problem.
3. Third Sentence: Sentence A, "We breathe polluted air, drink polluted water and eat polluted food," provides specific examples of how pollution affects daily life, leading to the health challenges mentioned in D.
4. Fourth Sentence: Sentence E, "Pollution produces many health challenges not only for all creatures but also for our environment," builds upon the previous sentences by broadening the scope of pollution's impact beyond just "all" (mentioned in D) to include "all creatures" and the "environment."
5. Fifth Sentence: Sentence C, "The question is rising how can we protect ourselves from this enemy," naturally concludes the paragraph by raising a question about solutions after the problem and its extensive effects have been described.

Therefore, the correct sequence is B, D, A, E, C.

Identifying the Second Sentence

Based on the logical arrangement B - D - A - E - C, the second sentence in the rearranged paragraph is sentence D.

The full rearranged paragraph would be:

B. Rising pollution is a very big problem for us. D. It is producing health challenges for all. A. We breathe polluted air, drink polluted water and eat polluted food. E. Pollution produces many health challenges not only for all creatures but also for our environment. C. The question is rising how can we protect ourselves from this enemy.

The second sentence in this meaningful paragraph is 'D'.