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: Sodium, Na, is in the same group as  
 (A) Ne. (B) Mg. (C) Ca. (D) K.

A: D
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Q: Which phase of the Moon occurs after a waxing gibbous?  
 (A) waning gibbous (B) waxing crescent (C) full moon (D) new moon

A: C
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Q: At which type of margin does mountain building produce mountains composed entirely of preexisting crust material?  
 (A) divergent boundary between two oceanic plates (B) divergent boundary between an oceanic plate and a continental plate (C) convergent boundary between an oceanic plate and a continental plate (D) convergent boundary between two continental plates

A:
D
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