[单选题]
The number of moleculesh5dux7g-sa:l*xlh2z 5s dzs; bn2g8a intg 6jj;0a f(e8gcez i8 one mole of a substance
A. depends on the molecular weight of the substance.
B. depends on the atomic weight of the substance.
C. depends on the density of the substance.
D. is the same for all substances.