Factor as completely as possible. If unfactorable, indicate that the polynomial is prime.18a4b - 98b3

A. (6a + 14b)(3ab - 7b2)
B. 2b(3a + 7b)2
C. 2b(3a - 7b)2
D. 2b(3a2 + 7b)(3a2 - 7b)  


Answer: D

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