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.

Example Input: What kind of energy conversion occurs after a candle is lit?  
 (A) friction to electrical energy (B) light energy to heat energy (C) mass to kinetic energy (D) chemical energy to light energy
Example Output: D

Example Input: The pull of gravity from Earth has the greatest effect on  
 (A) comets. (B) the Sun. (C) asteroids. (D) the Moon.
Example Output: D

Example Input: Each layer of Earth has different properties. Which statement best describes the mantle of Earth?  
 (A) The mantle lies below the core. (B) The mantle is composed of hot gases. (C) The mantle lies between the core and the crust. (D) The mantle temperature is lower than the crust temperature.
Example Output:
C