Give the Answer in Exact Form $$3 ^ { 2 x } - 3 \left( 3 ^ { x } \right) = 40$$

Multiple Choice

Give the answer in exact form.
- $$3 ^ { 2 x } - 3 \left( 3 ^ { x } \right) = 40$$

A) $\left\{ \log _ { 3 } 8 \right\}$
B) $\{ 3 \ln 8,3 \ln ( - 5 ) \}$
C) $\left\{ \log _ { 3 } 8 , \log _ { 3 } ( - 5 ) \right\}$
D) $\{ 3 \ln 8 \}$