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: A movie studio will use two methods of communication, television and the Internet, to advertise a new movie. Which of the following must both methods of communication use in order to show the advertisements to viewers around the world?
(A) systems to locate viewers (B) networks to transmit signals (C) printing to create the images (D) software to search for images
Example Output: B

Example Input: Which of the following is found in all living organisms?
(A) cell (B) organ (C) organ system (D) tissue
Example Output:
A