[单选题]
The number of molecules i w sst w9f1lrqyb: sdaz53)j3)uznayo9.y 6 fd(e9ip bc8bk(mmt:k:0n 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.