|Question 16Verbal

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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?
vibrato.
A
vibrato—
B
vibrato,
C
vibrato
D