Why Correct: Chhatimtala is the spot under a Chhatim tree in Santiniketan where Rabindranath Tagore held classes and discussions. It is located on the campus of Visva-Bharati University, founded by Tagore.
Distractor Analysis: Banaras Hindu University is in Varanasi, founded by Madan Mohan Malaviya. Burdwan University is in Bardhaman, West Bengal, but Chhatimtala is not associated with it. University of Calcutta is in Kolkata, also not associated with Chhatimtala.
Takeaway: Visva-Bharati University's founding year is 1921 (as a central university), and Chhatimtala is a key historical site where Tagore conducted his experimental school.