You are given a science question (hard-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.
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Question: When gasoline in a car engine is burned, only about 15 percent of the gasoline is converted into mechanical energy. This is because most of the energy in the gasoline is  
 (A) transformed into heat. (B) stored for use at a later time. (C) changed into chemical energy. (D) used to make the vehicle move.

Answer: A


Question: In a lab investigation, students use Brand X batteries in a flashlight and Brand Y batteries in a radio. After two hours, the flashlight stops working, but the radio continues to work. As a result, the students conclude that Brand Y batteries last longer. Which statement about the conclusion of the investigation is most accurate?  
 (A) The conclusion is valid because they tested two different brands. (B) The conclusion is invalid because the test had multiple variables. (C) The conclusion is valid because they conducted the investigation in a lab. (D) The conclusion is invalid because the real names of the batteries were hidden.

Answer: B


Question: Which theory of the origin of the Moon proposes that Earth's Moon formed by the same process that formed Mars, Jupiter, and Neptune?  
 (A) The Giant Impact Theory (B) The Fission Theory (C) The Capture Theory (D) The Coaccretion Theory

Answer:
D