Answer:
A. Telemarketing
Explanation:
Before the massification of internet use, telemarketing referred to the use of the telephone for marketing, for example: by contacting potential or existing customers through the phone.
Nowadays, telemarketing mainly refers to the use of the internet for the same purpose, although this is sometimes called "online marketing" as well.
We can see that Trevor is using a telemarketing strategy because it is based entirely on using a website to contact customers who are online shoppers in the first place.
