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Verbal·Standard English Conventions·Boundaries

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As jazz singer Sarah Vaughan honed her vocal abilities—acquiring a sophisticated timbre and precise control over pitch, dynamics, and __________ she earned comparisons to opera icon Leontyne Price, one of her personal heroes. The comparisons highlight how Vaughan, a jazz star, had transcended genre boundaries with her singing prowess.

Which choice completes the text so that it conforms to the conventions of Standard English?

A

vibrato—

B

vibrato.

C

vibrato,

D

vibrato