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]: When sodium hydroxide reacts with a copper nitrate solution, the reaction vessel needs to be kept on ice to slow down the reaction. What best describes this reaction?  
 (A) an exothermic reaction that absorbs energy (B) an exothermic reaction that releases energy (C) an endothermic reaction that absorbs energy (D) an endothermic reaction that releases energy
[EX A]: B

[EX Q]: Which of these properties of water helps moderate the weather of coastal areas?  
 (A) neutral pH (B) high specific heat (C) dissolves many substances (D) floats as a solid
[EX A]: B

[EX Q]: The process of gene regulation directly impacts  
 (A) how much DNA is stored. (B) how much DNA is replicated. (C) which mRNA is produced. (D) which tRNA is produced.
[EX A]:
C