_____ Is a Technique That Works Based on the Norm

_____ is a technique that works based on the norm for social commitment,whereas _____ is a technique that works based on self-perception theory.

A) Reciprocity;the door-in-the-face technique
B) The door-in-the-face technique;reciprocity
C) Lowballing;the foot-in-the-door technique
D) The foot-in-the-door technique;lowballing