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]: The Great Ocean Conveyer ocean current system runs north through the Atlantic from the equatorial region. If this current got disrupted, North American and European climates would become  
 (A) rainier. (B) colder. (C) windier. (D) more humid.
[EX A]: B

[EX Q]: Which of the following compounds is most likely to be part of living organisms?  
 (A) C?H??O? (B) BF? (C) MoCl? (D) CsI
[EX A]: A

[EX Q]: What is taken in by the leaves of a tree so it can make its own food?  
 (A) oxygen (B) sugar (C) sunlight (D) water
[EX A]:
C