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.

Ex Input:
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.

Ex Output:
D


Ex Input:
The greatest amount of diversity can be found among which type of organism?  
 (A) plants (B) animals (C) bacteria (D) fungi

Ex Output:
C


Ex Input:
Lamar learned that birds, mammals, and reptiles are all vertebrates. Which characteristic do all vertebrates share?  
 (A) They all lay eggs. (B) They all have feathers. (C) They all have a backbone. (D) They are all warm-blooded.

Ex Output:

C