A Television Infomercial Tells Viewers That They Can Get the World's

A television infomercial tells viewers that they can get the world's best steak knives for only $25.Right before the infomercial ends, viewers are told that if they call within the next 30 minutes, they will also receive a can opener for free.This example demonstrates the

A) door-in-the-face technique.
B) foot-in-the-door technique.
C) lowball technique.
D) that's-not-all technique.