Choice "B" is correct. There is no requirement of liquidation in a reorganization.
Choice "a" is incorrect. In a reorganization a plan of reorganization must be filed.
Choice "d" is incorrect. In a reorganization the plan of reorganization must be approved by the court.
Choice "c" is incorrect. In a reorganization each class of claimants has an opportunity to accept the plan (although it need not be accepted by all classes, such as unimpaired classes of security holders).