Simplify Assume That Variables in the Exponent Represent Nonzero Integers $\left( \frac { x ^ { 8 t } } { x ^ { 3 t - 6 } } \right) ^ { 3 }$

Multiple Choice

Simplify. Assume that variables in the exponent represent nonzero integers and that all other variables are not 0.
- $\left( \frac { x ^ { 8 t } } { x ^ { 3 t - 6 } } \right) ^ { 3 }$

A) $3 x ^ { t + 6 }$
B) $x ^ { 15 } t + 18$
C) $3 x ^ { 15 t } - 18$
D) $x ^ { 24 t }$