_____ refers to a method of selling in which catalogs, brochures, letters, videos, and other pieces of marketing materials are shipped straight to customers from which they can mail, call, or e-mail an order.
According to my research on the different selling methods that exist, I can say that based on the information provided within the question the method of selling being referred to is called Direct Mail. This method which is also known as direct response marketing has been around for years and is used by huge companies like Avon.
I hope this answered your question. If you have any more questions feel free to ask away at Brainly.
