Answer
The correct answer is (c)
Work Step by Step
When the reaction occurs, $KNO_3$ and $NO_3OH$ are formed. $K^+$ and $NO_3^-$ are present on both sides of the equation, so they are spectator ions. $H_2O$ is a weak electrolyte so it is not represented as dissociated ions. So, the net ionic equation is the one given in option (c)
