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: 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

A: A
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Q: When light is bounced off a mirror, the light is  
 (A) reflected. (B) refracted. (C) absorbed. (D) diffracted.

A: A
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Q: Which device produces mechanical energy?  
 (A) a battery (B) an electric motor (C) a light bulb (D) a solar cooker

A:
B
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