The Following Table Displays the Reservation Values of Eight Buyers

Multiple Choice

The following table displays the reservation values of eight buyers and eight sellers, who each want to buy or sell a calculator. You are in charge of deciding which buyer trades (or not) with which seller at what price as you see fit. You could prescribe different prices to each pair of a buyer and a seller.

-Refer to the table above.To achieve efficiency,which group of buyers should trade with which group of sellers?

A) All buyers and all sellers should trade.
B) Buyers 5-8 and sellers 1-4 should trade.
C) Buyers 1-5 and sellers 1-5 should trade.
D) Buyers 1-4 and sellers 5-8 should trade .