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: During which stage of an insect's life cycle does the female lay eggs?  
 (A) nymph (B) larva (C) pupa (D) adult

SOLUTION: D

PROBLEM: 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

SOLUTION: C

PROBLEM: It took Stephen 12 seconds to run across a grass field. Which additional information does he need in order to calculate his acceleration during the run?  
 (A) the direction he ran and the average speed (B) the distance he ran and the average velocity (C) the beginning speed and the direction he ran (D) the beginning velocity and the ending velocity

SOLUTION:
D