Simplify (Assume All Variables Are Nonzero $\frac { a ^ { 9 } b ^ { 7 } } { a ^ { 3 } b }$

Multiple Choice

Simplify. (Assume all variables are nonzero.)
- $\frac { a ^ { 9 } b ^ { 7 } } { a ^ { 3 } b }$

A) $( a b ) ^ { 19 }$
B) $a ^ { 6 } b ^ { 6 }$
C) $a ^ { 27 } b ^ { 7 }$
D) 21