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.

Q: A student is trying to identify a mineral that has a nonmetallic luster and is black. It can also be scratched with a fingernail. According to the mineral reference sheet, the unidentified mineral is most likely  
 (A) mica. (B) magnetite. (C) hornblende. (D) quartz.

A: A
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Q: Which phrase does not describe asexual reproduction in organisms?  
 (A) requires two parents (B) little variation in offspring (C) only one type of cell involved (D) duplicates its genetic material

A: A
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Q: The body of a fish is covered by scales for  
 (A) decoration. (B) protection. (C) coloration. (D) reproduction.

A:
B
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