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 is a response of the autonomic nervous system that helps maintain equilibrium in the body?  
 (A) shivering in cold temperatures (B) eating due to appetite (C) slapping at biting insects (D) pulling away from hot objects
Example Output: A

Example Input: A light year is used to measure  
 (A) time. (B) distance. (C) luminosity. (D) temperature.
Example Output: B

Example Input: Which is the best example of something that has kinetic energy?  
 (A) a rock sitting at the top of a steep hill (B) a tennis ball rolling across the court (C) a picture hanging on the wall (D) a piece of wood before it is burned
Example Output:
B