Which of the Following Directly Follows from the No Cash

Which of the following directly follows from the No Cash on the Table Principle?

A) In a transaction, the parties will negotiate over prices until neither one earns any surplus.
B) For a transaction to occur, the buyer's reservation price must be greater than the seller's reservation price.
C) For a transaction to occur, the buyer's reservation price must be less than the seller's reservation price.
D) Efficiency requires that the buyer's surplus equal the seller's surplus.