You are given a science question (easy-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.

Input: Consider Input: Which of the following is an example of a behavioral adaptation?  
 (A) hooves of a horse (B) migration of birds (C) a spider web (D) a bee hive

Output: B


Input: Consider Input: The moon goes through phases as it revolves around Earth. During which phase of the moon would it be possible for a solar eclipse to occur?  
 (A) new moon (B) full moon (C) waning (D) waxing

Output: A


Input: Consider Input: A student mixed baking soda with vinegar and observed that the reaction was endothermic. When is a reaction endothermic?  
 (A) when it is reversible (B) when it can be repeated (C) when it requires heat to make it happen (D) when energy is released by the process


Output: C