Detailed Solution:
The correct answer is “Rajendra Prasad”.
Subhash Chandra Bose became the President of the Congress Party in 1938. Tripuri session of Congress took place in 1939. He got elected but he had to resign due to his differences with Mahatma Gandhi. After the resignation of Subhash Chandra Bose, Rajendra Prasad was elected as the president.