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.
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Question: What determines how long the Moon takes to complete one cycle of phases?  
 (A) the period of rotation of the Moon around its axis (B) the period of revolution of the Moon around Earth (C) the period of rotation of Earth around its axis (D) the period of revolution of Earth around the Sun

Answer: B


Question: Which of the following best describes a role of mushrooms in ecosystems?  
 (A) capturing energy from sunlight (B) consuming living plant material (C) taking energy from animal hosts (D) breaking down dead plant material

Answer: D


Question: A family goes on vacation for a week. When they return home they discover that some vegetables in their refrigerator have gone bad. What is the most environmentally responsible thing for them to do with the rotten food?  
 (A) toss it into a fire pit and burn it (B) throw it in the trash to be taken to a landfill (C) put it in a compost pile to use for plant food (D) take it back to the grocery store and try to get their money back

Answer:
C