Answer:
The correct answer is a monopolistic competition.
Step-by-step explanation:
Monopolistic competition is a form of market in which there are a large number of buyers and sellers. The sellers are providing differentiated products which are close substitutes.
There is a high degree of competition in the market. The entry and exit in the market are relatively easier than a monopoly market.
To increase their market share and earn more profits, the firms take the help of branding and advertising.
In the given example, the supermarket chain is operating in monopolistic competition as it has to face a high degree of competition and is using branding, etc to create a niche for itself.