When Shopping in Some Countries, Bargaining Is Standard

When shopping in some countries, bargaining is standard. The sellers ask for a high price to start, and then decrease the price until the sale is made. This is due to

A) prices changing so quickly that it doesn't make sense to make price tags.
B) consumers trying to gain as much consumer surplus as they can.
C) producers trying to gain as much consumer surplus as they can.
D) the market unable to reach equilibrium.
E) no government control.