Solve $3 ^ { 3 x - 3 } = 729$

Multiple Choice

Solve: $3 ^ { 3 x - 3 } = 729$

A) {3}
B) {2}
C) $\left\{ \frac { 7 } { 2 } \right\}$
D) $\left\{ \frac { 1 } { 2 } \right\}$