Answer:
A
Explanation:
It unites music and drama because it is part of the orchestra music.
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A groin (or cross) vault is formed by the perpendicular intersection of two barrel vaults. A rib (or ribbed) vault is supported by a series of arched diagonal ribs that divide the vault's surface into panels.
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All the above is the correct answer
D is an open ended question because it requires an explanation.