The correct answer is option 1: 1935. The Act of 1935 introduced the concept of provincial autonomy in British India. Provincial autonomy refers to the delegation of powers and responsibilities to provincial governments, allowing them greater control over their own affairs. This was a significant shift from previous acts, such as the Act of 1919 and the Act of 1909, which did not grant as much autonomy to the provinces.

The Act of 1858, also known as the Government of India Act 1858, transferred the administration of India from the East India Company to the British Crown. However, it did not provide for provincial autonomy.

It is important to note that while the given answer is generally correct, it is always advisable to verify the information independently.