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.

Example Input: Which material is most easily recycled at school?  
 (A) plastic wrap (B) notebook paper (C) ice cream sticks (D) rubber erasers
Example Output: B

Example Input: Which of the following helps the body to cool down?  
 (A) shivering (B) sweating (C) running a fever (D) taking deep breaths
Example Output: B

Example Input: A student learns that one year on Mercury is about 88 Earth days. This means it takes 88 Earth days for Mercury to   
 (A) travel in orbit around its moon. (B) complete one rotation on its axis. (C) switch orbits with the nearest planet. (D) make one complete orbit around the Sun.
Example Output:
D