【单选题】Here are two negotiations about selling and buying a second-hand famous brand laptop computer. Case
A.
: The seller hopes to get RMB5,000 by selling the laptop, and his reservation price is RMB4,000. From the buyer's point of view, he notices that the computer may worth RMB3,500, but he will just bid RMB2,000 in the first place. Case
B.
: The seller hopes to get RMB6,000 by selling the laptop, and his reservation price is RMB4,500. From the buyer's point of view, he notices that the computer may worth RMB5,000, but he will just bid RMB3,000 in the first place. (25.0分)