Find a General Term an for the Geometric Sequence $$8 , - 2 , \frac { 1 } { 2 } , - \frac { 1 } { 8 } , \frac { 1 } { 32 } \ldots$$

Multiple Choice

Find a general term an for the geometric sequence.
- $$8 , - 2 , \frac { 1 } { 2 } , - \frac { 1 } { 8 } , \frac { 1 } { 32 } \ldots$$

A) $a _ { n } = 8 \left( - \frac { 1 } { 4 } \right) ^ { n - 1 }$
B) $a _ { n } = 6 \left( - \frac { 1 } { 6 } \right) ^ { n - 1 }$
C) $a _ { n } = \frac { 1 } { 8 } ( - 4 ) ^{n - 1}$
D) $a _ { n } = 8 \left( \frac { 1 } { 4 } \right) ^ { n - 1 }$