What is the complete factorization of the polynomial below?
x^3 + 2x^2 + 4x + 8

A. (x-2)(x+2i)(x-2i)

B. (x-2)(x+2i)(x-2i)

C. (x+2)(x+2i)(x+2i)

D.(x+2)(x+2i)(x-2i)