instruction:
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.
question:
Which tool is best used to collect information about the weather?  
 (A) ruler (B) stopwatch (C) thermometer (D) collecting net
answer:
C


question:
Scientists theorize that the original atmosphere of Earth was stripped away by the solar wind shortly after the formation of the planet. The Jovian planets are far enough from the Sun that the solar wind has less of an impact. Studies of the Jovian planets suggest the early atmosphere of Earth was mainly composed of which two gases?  
 (A) oxygen and argon (B) hydrogen and helium (C) carbon dioxide and nitrogen (D) sulfur dioxide and water vapor
answer:
B


question:
It can take millions of years for fossil fuels to form. These fossil fuels form underground from decaying plants and animals. Which term best describes a fossil fuel?  
 (A) a source of solar power (B) a source of electrical power (C) a source of renewable energy (D) a source of nonrenewable energy
answer:

D