A van der Waal'* gas obeys the equation of state (p+n2a/V2)(V-nb)= nRT . Its internal energy is given by U = CT – n2a-V . The equation of a quasistatic adiabat for this gas is given by-
(A) TC/nRV = constant
(B) T(C+nR)/nRV = constant
(C) TC/nR (V – nb) = constant
(D) P(C+nR)/nR(V – nb) = constant
