Which statement gives the reason why ammonia gas, $\text{NH}_3$, diffuses more quickly than hydrogen chloride gas, $\text{HCl}$?
- AAmmonia expands to occupy all of the space available.
- BAmmonia has a smaller relative molecular mass than hydrogen chloride.
- CAmmonia is an alkali and hydrogen chloride is an acid.
- DAmmonia molecules diffuse in all directions at the same time.