The four major competitive structures include all buta) monopoliesb) oligopoliesc) brandd) pure competitione) monopolistic competition

c) brand

Explanation:

The four competitive structures include;

Monopoly which is made up of a single seller but many buyers. The seller is the price setter of the goods or services offered.

Oligopoly is made up of few firms selling homogenous products.

Pure competition is characterized by large number of independent sellers who offer identical products. It has much less restrictions.

Monopolistic competition is made up of many sellers selling closely related but differentiated products.