Concept:The public sector consists of all businesses and industries owned and controlled by the government.
Explanation:Nationalized industries are formerly private firms that have been taken over by the state.
Once nationalized, these industries are controlled and financed by the government.
Therefore, they are included in the public sector of an economy.
Cooperative societies and joint stock companies are owned by private members or shareholders, not the government.
Pressure groups are interest organizations, not government-owned economic units.
Answer:B. Nationalized industries.