Factor completely.21x3 - 9x2 + 15x
A. 3x(7x3 - 3x2 + 5x)
B. 3(7x3 - 3x2 + 5x)
C. 3x(7x2 - 3x + 5)
D. x(21x2 - 9x + 15)
Answer: C
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