Simplify (3a

4 - 2a

2

+ 5a - 10) - (2a

4

+ 4a

2

+ 5a - 2).

A. a

4

+ 4a

2

+ 10a - 12

B. a

4

+ 2a

2

+ 10a - 12

C. 5a

4

+ 4a

3

+ 3a

2

+ 10a - 12

D. a

4 - 6a

2 - 8

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