Hint: The freedom movement was followed by the movement for the unification of Karnataka. After independence, the Mysore State was created in 1953.
Complete answer: Karnataka has a recorded history of more than 2,000 years. Mysore or later Karnataka is immensely important from the viewpoint of history. Many rulers (mainly native rulers) have ruled over this place for many years and many of them have saved the region from foreign invasion. Later during the British rule in India, Christian missionaries introduced English education and printing in the 19th century. Changes were brought in terms of transport, communication and even industries. There happened an enormous emergence of the urban-middle class people. The Mysore dynasty initiated and helped in the industrialisation and cultural growth.
After Independence of India from the British rule, the Mysore state was created in 1953, wherein all the Kannada dominant areas under different dispensations were unified and the enlarged Mysore state carved in 1956 which was later renamed as Karnataka in 1973.
Therefore, the correct answer id option C, that is the state of Mysore was renamed as Karnataka in the year 1973.
Note: Karnataka is one of the major milk producers of India. The state has 66% rural population and 55.60% of workers are agricultural labourers. Karnataka is one of the pioneer states in establishing hydroelectric projects in the country.