The correct option is D d
From ideal gas equation PV=nRT, we have ,
V=nR(TP)⇒V∝(TP)
Thus, when TP is maximum, V is maximum.
From the given diagram, we can deduce that,
(TP)d is maximum where T is maximum and P is minimum.
∴ V is maximum at ′d′.
Thus, option (d) is the correct answer.