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 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
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: During the construction of a new building, workers dug round holes in the ground and filled the holes with steel and concrete. Which of the following parts of the building was being built during this stage of construction?  
 (A) the floor (B) the foundation (C) the plumbing (D) the walls
Example Output:
B