Apply the Distributive Property to multiply 3a^3b^2(6ab + 7a^2b)

A: 9a^3b^2+10a^6b^2
B: 18a^4b^3+21a^5b^3
C: 9a^4b^3+10a^5b^3
D: 18a^3b^2+21a^6b^2

C: 9a^4b^3 + 10a^5b^3