[单选题]
The number of molecules in one mole of awjlj ( u,frj3,es1.ypae i25k nu3cd; substance k ev5472ygjw*i;j3xo y)otto
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.