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:
One substance found on Earth is more stable as an elemental gas than as part of a solid compound. As a result, this substance is very abundant in the atmosphere. Which substance exhibits these traits?
(A) argon (B) chlorine (C) nitrogen (D) oxygen
answer:
C

question:
In the morning, students observed puddles of water all over the playground. What would best explain why the playground was dry in the afternoon?
(A) Animals drank the water. (B) The wind stopped blowing. (C) Someone dried the puddles. (D) The water evaporated during the day.
answer:
D

question:
What causes a meteoroid to glow as it falls through the atmosphere of Earth?
(A) wind (B) gravity (C) friction (D) sunlight
answer:
C