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: The ounce, the pound, and the ton are units of  
 (A) time. (B) weight. (C) length. (D) distance.

SOLUTION: B

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: Evidence that living things have evolved over hundreds of millions of years can be found in  
 (A) particles in the air (B) rocks containing fossils (C) tree rings from recently logged trees (D) chemicals in human hair

SOLUTION:
B