Expand.(-3m + 3n)4
A. 81m4 - 5184m3n - 2916m2n2 - 324mn3 - 81n4
B. 81m4 - 324m3n - 486m2n2 - 324mn3 - 81n4
C. 81m4 - 5184m3n + 2916m2n2 - 324mn3 + 81n4
D. 81m4 - 324m3n + 486m2n2 - 324mn3 + 81n4
Answer: D
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