Two Containers of Equal Volume Contain Different Ideal Gases at the Same

Two containers of equal volume contain different ideal gases at the same temperature and pressure.It follows that

A) both containers hold the same number of molecules.
B) the total mass in the two containers is equal.
C) the average speed of the molecules of the two gases is equal.
D) the density of the two gases is equal.
E) the average momenta of the molecules of the two gases is equal.