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: One important use of coal is to produce energy for homes. Coal can be burned and converted to  
 (A) wind energy. (B) nuclear energy. (C) electrical energy. (D) solar energy.

SOLUTION: C

PROBLEM: Which form of energy is found in food?  
 (A) chemical (B) electrical (C) sound (D) mechanical

SOLUTION: A

PROBLEM: Which type of organism helps return nutrients from dead plants and animals to the soil?  
 (A) producer (B) prey (C) predator (D) decomposer

SOLUTION:
D