Answer: Buzz
Step-by-step explanation:
Based on the information given in the question, the above marketing is an example of buzz marketing. Buzz marketing is using wore of mouth in such a way that it'll work in ones favour whereby people will eventually start sharing it on their own or start talking about that product.
Since NYC Marketing gave celebrities new, frayed caps with the logo for its sanitation department, this can motivate people to start buying the goods sold by the company.