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: A model of the Moon would be different from a model of Earth in that the Moon should  
 (A) be smaller than Earth. (B) have a source of light inside. (C) have a smoother surface than Earth. (D) have fewer impact craters on the surface.
Example Output: A

Example Input: Which item is designed to change electrical energy into heat energy?  
 (A) Alarm clock (B) Hand dryer (C) Fan (D) Telephone
Example Output: B

Example Input: About how long does it take for Earth to make one revolution around the Sun?  
 (A) one day (B) one week (C) one month (D) one year
Example Output:
D