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: Vehicle exhaust contains a form of pollution called particulate matter. Technologies are being developed to reduce the amount of particulate matter in exhaust. A vehicle that produces less particulate matter would have the greatest impact on which aspect of human health?  
 (A) heart health (B) respiratory health (C) the rate of birth defects (D) weight and physical fitness

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: Which is the order of the planets from closest to the Sun to farthest from the Sun?  
 (A) Mercury, Venus, Earth, Mars (B) Mars, Mercury, Earth, Venus (C) Earth, Venus, Mercury, Mars (D) Venus, Earth, Mars, Mercury

SOLUTION:
A