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 item is designed to change electrical energy into heat energy?  
 (A) Alarm clock (B) Hand dryer (C) Fan (D) Telephone

SOLUTION: B

PROBLEM: A student is dropping objects of various sizes and shapes and recording the time it takes for each object to hit the ground. Which question is the student most likely trying to answer?  
 (A) What force slows some objects down? (B) What force pulls objects to the ground? (C) Do some objects fall more quickly than others? (D) Do objects break or bounce when hitting the ground?

SOLUTION: C

PROBLEM: Which statement best describes an atom with an atomic number of 20?  
 (A) The atom has 20 protons. (B) The atom has 20 neutrons. (C) The sum of the number of protons and electrons is 20. (D) The sum of the number of protons and neutrons is 20.

SOLUTION:
A