Algebra 2 Simplify The Expression Calculation Exercise Help

Simplify the expression.

fraction numerator 9 a cubed b squared minus 18 a squared b cubed over denominator 3 a squared b end fraction

A. 3 a b space minus space 18 a squared b cubed

B. 3 a b space minus space 6 b squared

C. 3 a to the power of 3 divided by 2 space end exponent b squared minus 6 a b cubed

D. 6 a b space minus space 15 a b cubed_x000D_