The figurative language device used by Baldwin is the paradox "vindictively polite. "
Paradox refers to a language device that involves the use of contradictory words and phrases. In this type of speech, the statement appears to contradict itself.
The author uses the words "vindictively polite" to describe the voice. The words vindictive and polite are contradictory to each other.
Therefore the correct option is D.
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