The correct answer is Waiting for a Visa.

• Waiting for a Visa is a 20-page autobiographical life story of B. R. Ambedkar written in the period of 1935–36.
  • It consists of reminiscences drawn by Ambedkar, related to his experiences with untouchability, in his own handwriting.
  • The book is used as a textbook at Columbia University.
  • The book consists of a very brief introductory passage followed by six sections; relating Ambedkar's experiences with untouchability, starting from his childhood.
  • Sections 1,2,3 and 4 consists of Ambedkar's own experiences, while Sections 5 and 6 consist of other people's experiences with untouchability.

• Who Were the Shudras is a history book published by Indian social reformer and polymath B. R. Ambedkar in 1946.
  • The book discusses the origin of the Shudra Varna. Ambedkar dedicated the book to Jyotirao Phule.
• Riddles in Hinduism is one of his many works B.R. Ambedkar did not get to publish in his lifetime.
  • Ambedkar began writing Riddles in Hinduism in the first week of January 1954 and completed it by the end of November 1955.
• Annihilation of Caste is an undelivered speech written in 1936 by B. R. Ambedkar. B.R.
  • Ambedkar was the first highly educated, politically prominent Dalit.
  • He wrote The Annihilation of Caste for the 1936 meeting of a group of liberal Hindu caste-reformers in Lahore.