The question asks us to rearrange five given sentences (A, B, C, D, E) to form a coherent and meaningful paragraph and identify the third sentence in that sequence.

Sentence Analysis and Logical Flow

Let's analyze each sentence to understand its role and connection to others:

• Sentence B: "Rising pollution is a very big problem for us." This sentence introduces the main topic, pollution, and establishes it as a significant issue. It serves as a good starting point for the paragraph.
• Sentence D: "It is producing health challenges for all." This sentence follows logically from sentence B, stating a direct consequence of the problem identified. The pronoun "It" clearly refers to pollution mentioned in sentence B.
• Sentence A: "We breathe polluted air, drink polluted water and eat polluted food." This sentence provides specific examples or reasons *why* pollution causes health challenges. It elaborates on the ways pollution affects "us" (mentioned in B) and leads to the "health challenges" mentioned in D. Therefore, it fits well after sentence D.
• Sentence E: "Pollution produces many health challenges not only for all creatures but also for our environment." This sentence further expands on the consequences. It builds upon sentence D ("health challenges for all") by specifying "all creatures" and adding the dimension of the "environment." It effectively broadens the scope after the specific examples in A.
• Sentence C: "The question is rising how can we protect ourselves from this enemy." This sentence poses a question about solutions or countermeasures. It acts as a concluding thought or a transition, logically following the description of the problem and its effects. "This enemy" refers back to pollution.

Determining the Correct Order

Based on the logical flow identified above, the most coherent order for the sentences is:

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

The sequence forms a paragraph that starts with the problem, details its effects (general health issues, specific ways we are affected, broader impact on creatures and environment), and concludes with a question about solutions.

Identifying the Third Sentence

In the determined rearranged order (B, D, A, E, C), the third sentence is A.