Detailed Instructions: 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: Stars appear to be blue, white, yellow, and red, even without the aid of a telescope. What causes the different colors of the stars?  
 (A) the surface temperature (B) the distance from Earth (C) the distance from the Sun (D) the gases that compose the star
A:
A