Find a Formula for the General Term $a _ { n }$

Find a formula for the general term $a _ { n }$ of the sequence $\left\{ 1 , - \frac { 12 } { 10 } , \frac { 19 } { 15 } , - \frac { 26 } { 20 } , \frac { 33 } { 25 } , \ldots \right\}$ .

A) $\frac { ( - 1 ) ^ { n - 1 } ( 5 + 7 n ) } { 5 ( n + 1 ) }$
B) $\frac { ( - 1 ) ^ { n } ( 5 + 7 n ) } { 5 n }$
C) $\frac { ( 5 + 7 n ) } { 5 ( n + 1 ) }$
D) $\frac { ( - 1 ) ^ { n } ( 5 - 7 n ) } { 5 ( n + 1 ) }$
E) $\frac { ( - 1 ) ^ { n } ( 5 + 7 n ) } { ( n + 1 ) }$
F) $\frac { ( - 1 ) ^ { n + 1 } ( 5 - 7 n ) } { 5 ( n + 1 ) }$
G) $\frac { ( - 1 ) ^ { n } ( 5 + 7 n ) } { 5 ( n + 1 ) }$
H) None of these

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