The market that most likely features monopolistic competition is:
A food court in a shopping mall with several related but differentiated products.
This option exemplifies monopolistic competition because it consists of many sellers offering products that are similar but differentiated (e.g., different types of food), allowing them to have some degree of market power. In contrast, the other options either reflect oligopoly (e.g., a market for oil with three major suppliers) or monopoly (e.g., a cable television market with a single-service provider). The market for corn could also indicate perfect competition due to many suppliers offering a homogeneous product.