$\text { Find a power series for the function } \frac { 1 } { 1 - 9 x } \text { centered at } 0 \text {. }$

Multiple Choice

$\text { Find a power series for the function } \frac { 1 } { 1 - 9 x } \text { centered at } 0 \text {. }$

A) $\sum _ { n = 0 } ^ { \infty } \left( \frac { x } { 9 } \right) ^ { n }$
B) $\sum _ { n = 0 } ^ { \infty } ( - 9 x ) ^ { n }$
C) $\sum _ { n = 0 } ^ { \infty } \left( \frac { 9 } { x } \right) ^ { n }$
D) $\sum _ { n = 0 } ^ { \infty } ( 9 x ) ^ { n }$
E) $\sum _ { n = 0 } ^ { \infty } ( - 1 ) ^ { n } ( 9 x ) ^ { n }$