The correct answer is (c) Haldwani.
Nainital, Dehradun, and Rishikesh are all municipal corporations with a mayor as the head of the corporation. Haldwani is a municipal board with a chairman as the head of the board.
A municipal corporation is a local government body that is responsible for the administration of a city or town. It is headed by a mayor, who is elected by the people of the city or town. The mayor is responsible for the day-to-day running of the city or town, and for ensuring that the services that are provided by the municipal corporation are of a high standard.
A municipal board is a local government body that is responsible for the administration of a smaller town or village. It is headed by a chairman, who is appointed by the state government. The chairman is responsible for the day-to-day running of the town or village, and for ensuring that the services that are provided by the municipal board are of a high standard.