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: Which land feature is formed from erosion by waves?   
 (A) a sandbar (B) a sea cliff (C) a barrier reef (D) a barrier island

A: B
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Q: Which statement best describes the development of a human embryo?  
 (A) A single cell becomes many cells. (B) Each cell has a different function. (C) Many cells combine to form one cell. (D) All the cells have the same function.

A: A
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Q: Endothermic reactions are reactions that require more energy to start than they give off in the products. Which statement describes an endothermic reaction?  
 (A) It gives off heat energy and is hot to the touch. (B) It absorbs heat energy and is cold to the touch. (C) It gives off light energy and produces visible light. (D) It gives off water and is wet to the touch.

A:
B
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