Find the Partial Sum of the Given Sequence $\mathrm { S } _ { \infty }$

Multiple Choice

Find the partial sum of the given sequence.
- $\mathrm { S } _ { \infty }$ of the sequence $\mathrm { a } _ { 1 } = 13 , \mathrm { r } = \frac { 1 } { 3 }$

A) $\frac { 13 } { 2 }$
B) $\frac { 39 } { 4 }$
C) $\frac { 13 } { 4 }$
D) $\frac { 39 } { 2 }$