Find the Indicated Term of a Geometric Sequence from the Given

Multiple Choice

Find the indicated term of a geometric sequence from the given information.
- $a _ { 5 } = \frac { 81 } { 16 }$ and $r = - \frac { 3 } { 4 }$ . Find $a _ { 1 }$ .

A) 16
B) $- 12$
C) $- \frac { 64 } { 3 }$
D) $- 16$