Write the Following Expression with a Single Exponent $$\frac { b ^ { 9 m } } { b ^ { 7 m } }$$

Multiple Choice

Write the following expression with a single exponent. Assume there is no division by 0. $$\frac { b ^ { 9 m } } { b ^ { 7 m } }$$

A) $b ^ { 16 m }$
B) $b ^ { 2 m }$
C) $b ^ { 63 m }$
D) $\frac { 1 } { b ^ { 2 m } }$
E) $b ^ { - 2 m }$