Answer
Drawing number $(iii)$ is the best representation for that situation.
Work Step by Step
Since the $NaOH$ is not in the solution, we can expect a pure $HA$ solution, and since it is a weak acid, it will be found in water in the $HA$ formula, because it didn't dissociated completely.
Therefore, $(iii)$ is the best representation, because it has the larger quantity of $HA$
