Factor completely 2x^3 + 6x^2 + 2x + 6.
A: 2[(x + 3)(x^2 + 1)]
B: (2x + 6)(x^2 + 1)
C: (x + 3)(2x^2 + 2)
D: 2(x^3 + 3x^2 + x + 3)