Subtract (3 + 2i) from (–9 – 8i).

Subtract by changing the signs of the number being subtracted: (−9 − 8i) − (3 + 2i) = −9 − 8i − 3 − 2i. Combine real parts and imaginary parts separately: (−9 − 3) + (−8i − 2i) = −12 − 10i. The correct choice is C, −12 − 10i.

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