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 statement describes all matter?  
 (A) All matter contains carbon. (B) All matter contains oxygen. (C) All matter is made up of cells. (D) All matter is made up of atoms.
Example Output: D

Example Input: Which are examples of inherited traits?  
 (A) specific beliefs (B) fingerprints (C) memories (D) nose shape
Example Output: D

Example Input: Which atomic structure has the greatest mass?  
 (A) electron (B) neutron (C) nucleus (D) proton
Example Output:
C