TASK DEFINITION: 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.
PROBLEM: Compared to Earth, the Moon is  
 (A) drier. (B) larger. (C) heavier. (D) brighter.

SOLUTION: A

PROBLEM: Calcium carbonate (CaCO_{3}) is considered a compound because it is made up of two or more  
 (A) molecules. (B) elements. (C) gases. (D) solids.

SOLUTION: B

PROBLEM: What is the most important property architects must consider when selecting materials for the walls, ceilings, and floors for a new concert hall?  
 (A) thermal properties (B) chemical properties (C) electrical properties (D) acoustical properties

SOLUTION:
D