Find the Radius of Convergence Of $\sum _ { n = 0 } ^ { \infty } ( 3 x ) ^ { n }$

Multiple Choice

Find the radius of convergence of $\sum _ { n = 0 } ^ { \infty } ( 3 x ) ^ { n }$ .

A) 3
B) 0
C) 2
D) $\frac { 1 } { 6 }$
E) 6
F) $\frac { 1 } { 3 }$
G) 1

H) $\frac { 1 } { 2 }$