Question

indirect distribution channels use ______ to sell their products to the end customers.
door - to - door sales
advertisements
middlemen
the internet

Explanation:

In indirect distribution channels, middlemen (such as wholesalers, retailers, agents) are used to facilitate the sale of products to end customers. Door - to - door sales and using the internet can be part of direct distribution, and advertisements are a promotional tool rather than a distribution channel component for indirect distribution. So the correct option is the one with middlemen.

Answer:

middlemen (the option with "middlemen" as the text)