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: A drug company developed a pill to reduce cases of stomach virus. To test the medication, half of the participants got the pill with the new medicine and half got a sugar pill. Which term best identifies the participants who got a sugar pill?  
 (A) control (B) experimental (C) dependent variable (D) independent variable
Example Output: A

Example Input: Energy appears in many forms. What form of energy is lightning?  
 (A) electrical energy (B) mechanical energy (C) magnetic energy (D) sound energy
Example Output: A

Example Input: Astronomers measure distances using very large units called light years. Which distance between celestial objects would most likely be measured in light years?  
 (A) distance between the Sun and Earth (B) distance between the Moon and Earth (C) distance between two stars in the same galaxy (D) distance between two planets in the same solar system
Example Output:
C