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: Compared to Earth, the Moon is
(A) drier. (B) larger. (C) heavier. (D) brighter.
Example Output: A

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: Which statement best explains why ice cubes will melt in a glass of tea?
(A) The tea becomes saturated. (B) The ice cubes gain energy. (C) The tea's freezing point increases. (D) The ice cube's melting point decreases.
Example Output:
B