c
since from ideal gas equation, $P V=n R T$
Hence, at constant pressure, $\frac{V}{T}=\frac{m}{M} \frac{R}{P}$
In the second case,
$\frac{V}{T}=\frac{2 m}{M} \frac{R}{2 P}=\frac{m}{M} \frac{R}{P}$
since the slope in two cases is same. Hence, new line will also be $B$. Curve does not pass through $0,0$ due to non idealities at low temperature and pressure.
Answer is option $C.$