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: When a hammer strikes a nail, the nail
(A) exerts balanced forces that helps it from moving. (B) exerts a force equal to the weight of the hammer. (C) exerts an unbalanced force that changes its velocity. (D) exerts an equal and opposite force back on the hammer.
Example Output: D

Example Input: Why does the leaf of a plant look green?
(A) Because it absorbs green light (B) Because it reflects green light (C) Because it absorbs only yellow and blue light (D) Because it reflects a mixture of yellow and blue light
Example Output: B

Example Input: When a beam of light passes through a clear, convex lens, the light will mostly
(A) diffract and spread out. (B) diffract and come to a focal point. (C) refract and come to a focal point. (D) refract and spread out.
Example Output:
C