Who is the author of the book 'Federation Versus Freedom"?

The correct answer is 3. 

Explanation: 

• ‘Federation Versus Freedom’, indeed is a book authored by Dr. B. R. Ambedkar.
• Dr. D. R. Gadgil invited Dr. Ambedkar to deliver a public address at the Gokhle Institute of Politics and Economics, in Puna. The address was delivered on 29th January 1939 and later compiled as a book by Dr. Ambedkar. 

• Here in this book, Dr. Ambedkar has presented a comprehensive understanding of the federation. He wrote about the development and progress of the federation during the British rule. He talked about the power, character, merits and demerits of the federation. 

• Through his public address, he tried to give a practical understanding to the general public so that they could form rational views, whether in support or against the federal structure. 

In Dr. Ambedkar’s words: 

‘So far as the Federation is concerned, the generality of the Indian public seems to be living in a fog. Beyond the fact that there is to be a Federation and that the Federation is a bad thing the general public has no clear conception of what is the nature of this Federation and is, therefore, unable to form an intelligent opinion about it. It is necessary that the general public should have in its hand a leaflet containing an outline of the Federal structure and a criticism of that structure in small compass sufficient to convey a workable understanding of the Scheme.’ 

Therefore, the correct answer is 3 - Dr. B. R. Ambedkar.