Pick out the correct statement.
(A) Ponchan-Savarit method is more accurate than McCabe-Thiele method
to determine the number of theoretical stages required for the separation of nonideal binary system by distillation
(B) A sharp decrease in pressure drop is an indication of flooding in a
distillation coloumn
(C) Solvent used in extractive distillation should be of high volatility
(D) Flash distillation is suitable for separating components which have very
close boiling temperature