Who was the President of Indian National Congress during the visit of Cabinet Mission to India?
Think of Cabinet Mission Plan (1946) as a book you have already read. On the page about who was the President of Indian National, the name written there is Maulana Abul Kalam Azad. That is the whole answer. No trick here. Just a simple fact that you can recall in a few seconds.
Ref: [Kerala PSC (Pre) 2018 UPPCS (Mains) 2008] | Bipan Chandra, India's Struggle for Independence, and NCERT History textbooks discuss Cabinet Mission Plan (1946) and explain the events, leaders and movements that support the correct answer for this question.