Find a Possible Formula for the General Term of the Given

Find a possible formula for the general term of the given sequence, assume that the first term has index 0. $\left\{ \frac { 1 } { 3 } , \frac { 2 } { 5 } , \frac { 3 } { 7 } , \frac { 4 } { 9 } , \ldots \right\}$

A) $\left\{ \frac { n - 1 } { 2 n + 1 } \right\} _ { n = 0 } ^ { \infty }$
B) $\left\{ \frac { 2 n - 1 } { 4 n - 1 } \right\}$
C) $\left\{ \frac { n - 1 } { 2 n + 3 } \right\} _ { n = 0 } ^ { \infty }$
D) $\left\{ \frac { n + 1 } { 2 n + 3 } \right\} _ { n = 0 } ^ { \infty }$