The sum of $$6xy(2x - 4z)$$ , $$3yz(2x - 3z)$$ and $$4xz(3y - 2y)^{2}$$is

A

$$12x^{2}y$$ - 18xyz - $$9yz^{2}$$ - $$4xy^{2}$$z

B

$$12x^{2}y - 18xyz + 9yz^{2} + 4xy^{2}z$$

C

$$12x^{2}y - 18xyz - 9yz^{2} + 4xy^{2}z$$

D

$$12x^{2}y + 18xyz - 9yz^{2} + 4xy^{2}z$$