Abel,a Teenager,is Trying to Earn Money by Operating a Dog

Multiple Choice

Abel,a teenager,is trying to earn money by operating a dog walking service.Abel is knocking on the door of every dog owner within a six-block radius of his house and asking if the homeowner would like to use his service.Abel is using the _____ method of prospecting.

A) public demonstration
B) group
C) referral
D) cold canvass
E) endless chain