The correct answer is B. Mailara Mahadevappa.
Mailara Mahadevappa was a freedom fighter from Karnataka who led the ‘Karwar Satyagraha’ in 1930. The satyagraha was a protest against the British government’s salt monopoly. Mahadevappa and his followers marched to the sea to make salt from seawater, in defiance of the British law. The satyagraha was successful in drawing attention to the salt monopoly and in forcing the British government to make some concessions.
N.S. Hardikar was a freedom fighter from Maharashtra who was involved in the Non-Cooperation Movement and the Quit India Movement. He was not involved in the Karwar Satyagraha.
R.R. Diwakar was a freedom fighter and social reformer from Karnataka. He was not involved in the Karwar Satyagraha.
Umabai Kundapur was a freedom fighter and social reformer from Karnataka. She was not involved in the Karwar Satyagraha.