When Comparing 1000 Amu of Carbon Atoms with 1000 Amu

When comparing 1000 amu of carbon atoms with 1000 amu of helium atoms:

A) each sample has the same number of atoms.
B) there are more carbon atoms than helium atoms.
C) there are more helium atoms than carbon atoms.
D) it is not possible to tell which sample contains more atoms.
E) helium is a gas, so it is less dense than the carbon, and therefore there would be fewer atoms.