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: Which process causes water to move from the ocean to the atmosphere during the formation of a hurricane?  
 (A) condensation (B) evaporation (C) precipitation (D) runoff
Example Output: B

Example Input: Which substance do all living things require to survive?  
 (A) blood (B) water (C) carbon dioxide (D) organic soil
Example Output: B

Example Input: According to the Big Bang Theory, how is the universe changing?  
 (A) It is contracting. (B) It is expanding. (C) Only the rim is expanding. (D) Only the center is contracting.
Example Output:
B