Answer
C
Work Step by Step
$CH_3CO_2H(aq)+NaOH(aq)\rightarrow CH_3CO_2Na(aq)+H_2O(l)$
Expanding the ions of the salt
$CH_3CO_2H(aq)+Na^+(aq)+OH^-(aq)\rightarrow$
$\quad CH_3CO_2^-(aq)+Na^+(aq)+H_2O(l)$
Removing duplicates
$CH_3CO_2H(aq)+OH^-(aq)\rightarrow H_2O(l)+CH_3CO_2^-(aq)$