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: When the cardboard cone of a radio speaker vibrates, it produces a sound in the air around it. The cone produces this sound by transferring which of the following to the air around it?  
 (A) heat (B) current (C) wave motion (D) magnetic force

SOLUTION: C

PROBLEM: Which could be a possible way to prevent wildlife species from becoming endangered?  
 (A) drinking less water (B) establishing more habitats (C) cutting down more forests (D) stopping underground coal mining

SOLUTION: B

PROBLEM: Two scientists doing the same experiment got different results. Which would be the best way to figure out which result might be correct?  
 (A) A group of scientists should argue about the results. (B) The two scientists should do different experiments. (C) More scientists should do the experiment. (D) A group of scientists should vote.

SOLUTION:
C