The single sole company which has the access to sell in a market with many barrier of entry according to the market structure is the monopoly.
Answer: Option C
Explanation:
Monopoly market structure as the name suggests, is the structured marketization where mono that is one seller or the one company sells or access the entry to all the consumer or poly consumer over the market with many barriers.
The monopoly structure is seen in Indian market as the India post service. The Indian Post has access to all the residents of India with the monopoly as no other post service is available in India.
