Which of the following in aqueous solutions shows relatively higher pH ?

$NaCl$ is a neutral salt, so the pH of $NaCl$ in aqueous solution is equal to 7.

$N{H}_{4}Cl$ and $N{a}_{3}P{O}_4$ is mainly acidic in nature, so the pH of those solution is lower than pH 7.

And $KOH$ is basic in nature. So $KOH$ has relatively higher pH.