The expansion of an ideal gas of mass m at a constant pressure P is given by the straight line (D) Then the expansion of the same ideal gas of mass 2m at a pressure P/2 is given by the straight line

PV∞MT⇒VT∝MPHere (M/P) represents the slope of curve drawn on vol­ume and temperature axis.For the first condition slope (M/P) graph is D (given in the problem) For the second condition slope2MP/2=4MPi.e., slope becomes four times so graph A is correct in this condition