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: The parts of plants that make seeds are the  
 (A) roots. (B) stems. (C) flowers. (D) leaves.
Example Output: C

Example Input: What is a common use of the mineral graphite?  
 (A) to make glass (B) as a source of iron (C) to make pencil leads (D) as a household cleaner
Example Output: C

Example Input: Trees start as seeds and grow into mature trees that produce more seeds. This pattern represents a  
 (A) food chain (B) life cycle (C) food supply (D) life span
Example Output:
B