After Making What You Thought Was a Great Deal on a New

After making what you thought was a great deal on a new car, the salesperson tells you that there has been a mistake in his addition and that the car is really going to cost you about $1000 more than you had originally agreed to. The salesperson is using a technique that is called

A) door-in-the-face.
B) low-balling.
C) foot-in-the-door.
D) norm of reciprocity.
E) high-balling.