Choose the One Alternative That Best Completes the Statement or Answers

Choose the one alternative that best completes the statement or answers the question.
The nth term of a sequence is given. Write the first four terms of the sequence.
- $$a _ { n } = \frac { ( - 1 ) ^ { n } } { n ^ { 2 } + 4 }$$

A) $\frac { 1 } { 5 } , - \frac { 1 } { 8 } , \frac { 1 } { 13 } , - \frac { 1 } { 20 }$
B) $- \frac { 1 } { 4 } , \frac { 1 } { 5 } , - \frac { 1 } { 8 } , \frac { 1 } { 13 }$
C) $- \frac { 1 } { 5 } , \frac { 1 } { 8 } , - \frac { 1 } { 13 } , \frac { 1 } { 20 }$
D) $\frac { 1 } { 4 } , - \frac { 1 } { 5 } , \frac { 1 } { 8 } , - \frac { 1 } { 13 }$