What was KBC 13's ₹7-cr question that wasn't answered by Himani Bundela?

Agra's Himani Bundela, the first to win ₹1 crore on 'Kaun Banega Crorepati' season 13, was asked, "What was the title of...thesis that Dr BR Ambedkar submitted to...London School of Economics for which he was awarded his doctorate in 1923?" to win ₹7 crore. She decided to quit as she didn't know the answer. The correct answer is option B.