Explanation:

The proposed all India federation included 11 provinces of British India, 6 Chief Commissioners Provinces and those princely states who might accede to the federation. The term on which a state joined the Federation were to be laid down in the Instrument of Accession. Joining the federation was compulsory for the British Provinces and chief commissioner’s provinces. For princely states, the accession to the Federation was voluntary. The federation could not be established until: A number of states, the rulers whereof were entitled to choose not less than half of the 104 seats of the council of state, and the aggregate population whereof amounted to be at least one half of the total population of all the Indian stales had acceded to the federation. Princely states never joined, and thus the federation never came into being. So, (a) is correct.

The Government of India Act 1935 derived material from four key sources viz. Report of the Simon Commission, discussions at the Third Round Table Conference, the White Paper of 1933 and the reports of the Joint select committees. This act ended the system of dyarchy introduced by GOI Act 1919 in provinces and introduced it in the centre.