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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