Three samples of the same gas $A, B$ and $C$ $(\gamma = 3/2)$ initially have equal volume. Now the volume of each sample is doubled. The process is adiabatic for $A$,isobaric for $B$ and isothermal for $C$. If the final pressures are equal for all three samples,the ratio of their initial pressures is:
- A$2\sqrt{2} : 2 : 1$
- B$2\sqrt{2} : 1 : 2$
- C$\sqrt{2} : 1 : 2$
- D$2 : 1 : \sqrt{2}$
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