Step 1: Recall what each ownership type means.
Public sector firms are government owned, private sector firms are owned by individuals or companies, joint sector firms are owned jointly by government and private players, and cooperative sector firms are owned by their own members. Step 2: Place each company in its category.
ONGC is run by the Government of India, so it is public sector, Airtel is a privately owned company, Maruti Suzuki is the standard joint sector example, and Amul Dairy is owned and run by its member farmers, making it cooperative. Step 3: Line up the matches.
This gives a to (iii), b to (iv), c to (ii), and d to (i).
Hence, the correct match is option (C).
