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.

Input: Consider Input: In a northern state, a room used for growing plants is not allowing enough light to enter for healthy plant growth. Adding windows in walls facing which direction would best solve this problem?  
 (A) north (B) south (C) east (D) west

Output: B


Input: Consider Input: 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

Output: B


Input: Consider Input: During its lifetime, which object is known to change in brightness, color, and temperature?  
 (A) star (B) moon (C) asteroid (D) planet


Output: A