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: Which of these elements is found in the greatest amount in organisms?  
 (A) carbon (B) iron (C) lead (D) neon

SOLUTION: A

PROBLEM: In some locations, squirrels sleep for long periods of time during the winter months. Which of the following most likely causes these squirrels to sleep for long periods of time?  
 (A) increase in humidity (B) decrease in temperature (C) clouds forming in the sky (D) winds blowing in the night

SOLUTION: B

PROBLEM: Which statement best explains Earth's day and night cycle?     
 (A) Earth rotates once each day on its axis. (B) Earth revolves around the Sun each year. (C) The Sun is closest to Earth during the day. (D) The tilt of Earth changes throughout the year.

SOLUTION:
A