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.

[Q]: 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.
[A]: B


[Q]: Four students tried to find out which magnet was the strongest. They each shared one idea. Which idea shows scientific thinking?  
 (A) We can pick the longest magnet. (B) We can pick the heaviest magnet. (C) We can measure the strength of the magnets. (D) We can vote for the magnet that we think is the strongest.
[A]: C


[Q]: An earthquake in the Earth's crust under the ocean releases sound waves. Which statement accurately describes how the sound waves spread?  
 (A) They spread in all directions away from their source. (B) They remain trapped near the source by water pressure. (C) They travel mostly horizontally along the ocean floor. (D) They travel mostly upward toward the surface of the water.
[A]:
A