A Horse Stable Operator,who Reads an Ad for a Worming

A horse stable operator,who reads an ad for a worming medicine,decides to call the toll-free number provided in the ad to see if the company can deliver 40 doses of its worming medicine before Saturday morning.In the context of the advertisement,this is referred to as:

A) acting as a source.
B) providing feedback.
C) creating a persona.
D) using bi-lateral marketing communications.
E) creating a new communication channel.