Perform the Indicated Operations Involving Rational Expressions $- \frac { 7 x ^ { 3 } y ^ { 3 } } { 8 }$

Multiple Choice

Perform the indicated operations involving rational expressions. Match each expression with the corresponding answer.
- $- \frac { 7 x ^ { 3 } y ^ { 3 } } { 8 }$

A) $\frac { 3 x y } { 32 y ^ { 4 } } \cdot \frac { 4 x ^ { 3 } y } { - 21 x }$
B) $\frac { - 3 x y ^ { 4 } } { 4 y ^ { 2 } } \cdot \frac { 28 x ^ { 2 } y ^ { 3 } } { 24 y ^ { 2 } }$