In What Circumstances Is a One-Time Listing Most Commonly Used

In what circumstances is a one-time listing most commonly used?

A) in cases where the seller has a set amount they wish to receive and does not care about the details of the transaction
B) in cases where the seller agent is worried the sellers will quickly undercut her and sell their property themselves with too much advertising
C) in circumstances when the listing agent has a buyer in mind and does not want to avail the listing to multiple offers
D) when the buyer agent is a member of the same brokerage firm as the seller agent
E) in circumstances where the seller agent believes there will be multiple competitive offers for a property