A

$\displaystyle\sum_{n=1}^{\infty}(-1)^n\dfrac1{n+1}$

B

$\displaystyle\sum_{n=1}^{\infty}\ln\left(1+\dfrac1n\right)$

C

$\displaystyle\sum_{n=1}^{\infty}\sin\dfrac1n$

D

$\displaystyle\sum_{n=1}^{\infty}\dfrac{n^n}{n!}$