instruction:
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.
question:
The change in fur color of the Arctic hare from brown in the summer to white in the winter is an example of  
 (A) mimicry. (B) heredity. (C) diversity. (D) camouflage.
answer:
D


question:
Which force produces energy as heat?  
 (A) pull (B) gravity (C) friction (D) magnetic
answer:
C


question:
A marble is dropped in a glass of water. Which force pulls the marble to the bottom of the glass?  
 (A) electricity (B) friction (C) gravity (D) magnetism
answer:

C