The vapour density of completely dissociated sociated $N{H}_{4}CL$ would be

A. Determined by the amount of solid $N{H}_{4}CL$ used in the experiment

B. Triple to that of $N{H}_{4}CL$

C. Half of that $N{H}_{4}CL$

D. Slightly less than half of that of $N{H}_{4}CL$