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 rubber band will make a sound when it is  
 (A) vibrated. (B) stretched. (C) cut into pieces. (D) shot across a room.

A: A
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Q: Parents with freckles often have children with freckles. This occurs because  
 (A) freckles develop from light. (B) certain foods cause freckles. (C) certain habits cause freckles. (D) freckles are an inherited trait.

A: D
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Q: Corals are small marine organisms that live in groups and make hard outer skeletons to protect their bodies. Over time, these outer skeletons can build up to make large coral reefs. Which of the following statements best describes one way the formation of a coral reef changes the ocean ecosystem?  
 (A) It makes the ocean water saltier. (B) It removes sand from the ocean floor. (C) It causes ocean waves to become stronger. (D) It creates a habitat for some ocean animals.

A:
D
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