What is the product of (2x^2 + 4x-2) and (3x+6) ?
O A. 6x^3 +12x^2 +24x - 12
B. 6x^3 + 24x^2 - 18x-12
C. 6x^3 + 12x^2 - 6x - 12
D. 6x^3 + 24x^2 +18x -12