George Stacked Some Old Tires at the End of His

Multiple Choice

George stacked some old tires at the end of his driveway with a red sign,"Free tires.Some good tread left." The tires remained there for months,without anyone buying them.He replaced the red sign with a black sign,"Last set of original Model QZ tires - Available for only $100 through month end.Knock on first green door on the right for details or leave your telephone number." The next morning,the tires had been stolen.George had inadvertently used the social influence weapon of:

A) liking.
B) scarcity.
C) anonymity.
D) reciprocity.
E) appeals to authority.