Find a Formula For $s_{n}$ , N $\ge$ 1, for the Sequence $7,-\frac{7}{2}, \frac{7}{3},-\frac{7}{4}, \frac{7}{5}$

Multiple Choice

Find a formula for $s_{n}$ , n $\ge$ 1, for the sequence $7,-\frac{7}{2}, \frac{7}{3},-\frac{7}{4}, \frac{7}{5}$

A) $s_{n}=\frac{7(-1) ^{n+1}}{n}$
B) $s_{n}=\frac{7(-1) ^{n}}{n}$
C) $s_{n}=\frac{7(-1) ^{n+1}}{n+1}$
D) $s_{n}=\frac{7(-1) ^{n}}{n+1}$