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.

[Q]: 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
[A]: B


[Q]: The fusion reaction that fuels the Sun converts hydrogen into  
 (A) carbon. (B) iron. (C) neon. (D) helium.
[A]: D


[Q]: At certain times of the year, meteor showers can be observed from Earth. Why are these objects from space usually harmless?  
 (A) They are always microscopic. (B) They are closer to the sun than to Earth. (C) They are made of soft, spongy materials. (D) They burn up high in Earth's atmosphere
[A]:
D