Simplify: 6x3y2 (4x4 − 3xy)

a .24x7y2 − 18x4y3
b.24x12y2 − 18x4y3
c. 10x7y2 − 9x4y3
d. 24x7y2 − 18x3y3
I think it's B but I am not really sure .