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: Humans use both renewable and nonrenewable resources. Which human activity uses a nonrenewable resource?
(A) building houses with wood (B) using natural gas to heat homes (C) using solar energy to power lights (D) producing electricity from flowing water

SOLUTION: B

PROBLEM: Which is the greatest benefit of sexual reproduction?
(A) capable of reproducing by meiosis (B) ability to reproduce without a mate (C) ability to produce genetically different offspring (D) capable of producing offspring genetically identical to parent

SOLUTION: C

PROBLEM: Drake has started a garden. What can Drake do to enrich the soil so that his plants will grow better?
(A) remove earthworms (B) add more water to the soil (C) increase the amount of pesticide he uses (D) mix decomposed plant matter into the soil

SOLUTION:
D