If the molar ratio of two different gases is $n_1 : n_2$,then which of the following is $NOT$ necessarily equal to $n_1 : n_2$?
- AVolume ratio at same $T$ and $P$
- BRatio of the number of molecules
- CRatio of their partial pressures in a mixture
- DRatio of their densities at same $T$ and $P$
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