Factor the trinomial completely. Remember to factor out the greatest common factor (GCF) first. The trinomial is 6x^3 + 30x^2 + 24x. Choose the correct option below and fill in the answer box within your choice.

A. 6x^3 + 3

B. 6x(x + 2)(x + 2)

C. 6x(x + 4)(x + 1)

D. 6x(x + 1)(x + 4)