The correct answer is option 3, the Act of 1935. The Act of 1935 introduced a federal structure for India, which divided power between the central government and the provinces. This Act was a result of extensive discussions and deliberations between the British government and Indian political leaders. It provided for the establishment of a federal government at the center, with separate governments for provinces that had varying degrees of autonomy. The Act of 1935 was an important step towards self-governance in India, as it granted more power to the Indian political class and allowed for greater participation in the decision-making process. This act served as a precursor to the Indian Constitution, which was adopted in 1950 and established India as a federal republic.