To obtain integrated form of Clausius-Clapeyron equation, ln (P2/P1) = (ΔHV/R) (1/T1 – 1/T2) from the exact Clapeyron equation, it is assumed that the____________________?

• A. Volume of the liquid phase is negligible compared to that of vapour phase
• B. Vapour phase behaves as an ideal gas
• C. Heat of vaporisation is independent of temperature
• D. All A , B. & C.