Schwan's Sales Enterprises of Marshall, Minnesota, markets a full line of frozen foods in 49 states and parts of Canada using door-to-door salespeople who sell from refrigerated trucks. This particular method of distribution is called a

Direct channel

Step-by-step explanation:

The direct channel method of distribution occurs when the producer sells a product directly to the consumer without any intermediaries. In this case, since the salespeople, who are linked to Schwan's Sales Enterprises, go directly to the consumer door-to-door, this can be classified as a direct channel.