Answer: D — Private Sector
The sector owned by private individuals or companies, with profit as its motive, is the Private Sector. Tata Iron and Steel Company (TISCO) is a classic example of this sector.
The passage directly states: "In the private sector, ownership of assets and delivery of services is in the hands of private individuals or companies... Activities in the private sector are guided by the motive to earn profits... companies like Tata Iron and Steel Company Limited (TISCO)... are privately owned." All three clues in the question — profit motive, private ownership, and TISCO — point to Private Sector (D). Do not confuse with Public Sector (government-owned) or Cooperative Sector (jointly owned by members).
Source: Sectors in Terms of Ownership: Public and Private Sectors, Chapter 2