Ada Had Missed the Notes for Several Classes and Asked

Ada had missed the notes for several classes and asked Rob for the notes for one day.Rob gave the notes to Ada,who copied them and then asked Rob for a week's worth of notes.Because of the ________,Rob is highly likely to give Ada the notes.

A) foot-in-the-door technique
B) two stage compliance approach
C) lowball technique
D) door-in-the-face technique
E) ingratiation approach