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: A hearing aid is a small device that contains an amplifier, a battery, a microphone, and a speaker. Which part of a hearing aid functions to detect sounds in the user's environment?
(A) the amplifier (B) the battery (C) the microphone (D) the speaker
Example Output: C

Example Input: 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.
Example Output: C

Example Input: Which type of tissue functions to move the bones?
(A) skin (B) blood (C) muscle (D) brain
Example Output:
C