Detailed Solution:
The correct answer is “S.C. Bose”.
S.C. Bose regarded the Karachi Session of the Indian National Congress (1931) as the height of Mahatma Gandhi's popularity and influence.
It was a special session of the Indian National Congress, held in Karachi from March 26 to 31, 1931, to endorse the Gandhi-Irwin Pact (signed on March 4, 1931). The session was presided over by Sardar Vallabhbhai Patel.