Detailed Instructions: In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").
Q: Fact1: Ethologists usually study how animals behave in their natural environment., Fact2: Germs are a natural part of the environment., Question: Ethologists usually study how animals behave around what? (A) Birds (B) germs (C) islands (D) humans (E) Summer (F) food (G) seasons (H) wetland
A:
B