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 about plant and animals cells is true?  
 (A) Both have a cell wall to give them support. (B) Both have a large vacuole to store water. (C) Both use mitochondria to produce energy. (D) Both use chloroplasts to store energy.
Example Output: C

Example Input: Rocks are classified as igneous, metamorphic, or sedimentary according to  
 (A) their color (B) their shape (C) how they formed (D) the minerals they contain
Example Output: C

Example Input: What chemical symbol represents the element copper?  
 (A) C (B) Co (C) Cp (D) Cu
Example Output:
D