Answer:
The correct answer is option II and III only.
Explanation:
Monopolistic competition is a market structure where there is a large number of buyers and sellers. The sellers in this market sell differentiated products which are close substitutes.
There is a very low restriction on the entry of new firms in the market. Because of differentiated products each firm has some degree of market power. The firms face a downward-sloping demand curve. This means that the firms decide the price level.
Though the firms enjoy zero economic profits in the long run.