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]: A model of the Moon would be different from a model of Earth in that the Moon should
(A) be smaller than Earth. (B) have a source of light inside. (C) have a smoother surface than Earth. (D) have fewer impact craters on the surface.
[A]: A

[Q]: Air is composed of many different substances. Which of the following components of air is a compound rather than an element?
(A) Argon, Ar (B) Oxygen, O2 (C) Water, H2O (D) Nitrogen, N2
[A]: C

[Q]: Deer live in forest for shelter. If the forest was cut down, which situation would most likely happen?
(A) The deer would find shelter in a different habitat. (B) The deer would wait for the forest to grow back. (C) The deer would move to another forest area. (D) The deer would change the type of foods they eat.
[A]:
C