Please, help me. I'm not sure what to do.
Factor completely: 8x5 + 28x4 + 12x3
A) 2x3(2x + 6)(x + 1)
B) 2x3(2x - 6)(x - 1)
C) 4x3(2x + 1)(x + 3)
D) 4x3(2x - 1)(x - 3)