Concept:Itinerant trading is a type of retail trade in which the seller moves from one place to another on foot to sell goods.
Explanation:The word "itinerant" means travelling from place to place.
An itinerant retailer has no fixed or permanent place of business.
He moves from street to street, market to market, or village to village on foot.
This type of seller usually carries small quantities of goods and invests very little capital.
Mail order business uses the postal service, barter involves exchanging goods for goods, and self service is a method used in fixed retail shops.
Hence, selling articles from place to place on foot is known as itinerant trading.
Answer:B. itinerant trading