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.

[EX Q]: In gym class a student kicks a soccer ball high into the air. As the ball goes upward, which type of energy is increasing?  
 (A) kinetic energy (B) thermal energy (C) potential energy (D) mechanical energy
[EX A]: C

[EX Q]: 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
[EX A]: B

[EX Q]: As a satellite falls toward Earth, the gravitational force between the satellite and Earth increases. Which statement best explains why there is an increase in gravitational force?  
 (A) As the satellite gets closer to Earth, the satellite cools. (B) As the satellite approaches Earth, the satellite rotates faster. (C) The mass of the satellite increases as it nears Earth. (D) The distance between Earth and the satellite decreases.
[EX A]:
D