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.

[EX Q]: A class made a solar cooker out of a large can. What color should they paint the can in order to collect the most heat?  
 (A) black (B) green (C) pink (D) white
[EX A]: A

[EX Q]: 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
[EX A]: B

[EX Q]: The brain, spinal cord, and nerves are organs that perform which primary function?  
 (A) supporting the body and enabling it to move (B) transporting oxygen, wastes, and nutrients throughout the body (C) producing male and female gametes (D) conducting messages to coordinate body functions
[EX A]:
D