6B2C-12B2C3+3B3C2
is it..
A. 3b2C2(4C-1)
B. 3B2 C(2-4BC-C)
C. 3B2 C(2-4C2+BC)
D. 3B2 C(2-4C2 -C)
6B2C-12B2C3+3B3C2 =
Take out the greatest common factor first (3B2C)
(3B2C)(2 - 4C2 + BC )
So...the answer is "C"