9. Simplify (3a4 - 2a2 + 5a - 10) - (2a4 + 4a2 + 5a - 2).

A. a4 - 6a2 - 8

B. a4 + 2a2 + 10a - 12

C. a4 + 4a2 + 10a - 12

D. 5a4 + 4a3 + 3a2 + 10a - 12

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