Which shows one way to determine the factors of x^3 + 4x2 + 5x +20 by grouping?

Ax(x^2+4) + 5(x^2+4)

BX^2(x+4) +5(x+4)

Cx^2(x+5) +4(x+5)

Dx(x^2+5) + 4x(x^2+5)