The Congress formed ministries after 1937 provincial elections in:

The correct answer is: (C) Seven provinces. After the 1937 provincial elections according to the Government of India Act 1935, the Indian National Congress won in 7 provinces and formed ministries in those provinces. The provinces were: Bombay, Madras, Central Provinces, United Provinces, Bihar, Orissa, and NWFP (North-West Frontier Province). Bengal and Punjab were exceptions, where Congress did not form the government.