Subtract (3 + 2i) from (–9 – 8i).

Subtracting (3 + 2i) from (–9 – 8i) means calculate (–9 – 8i) – (3 + 2i). Subtract the real parts and the imaginary parts: –9 – 3 = –12, and –8i – 2i = –10i. The result is –12 – 10i, choice C.

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