The Indian Independence Act of 1947 was a legislation that facilitated the partition of India and granted independence to both India and Pakistan. Among the changes brought about by this act, option 1 states that the Government of India Act, 1935 was amended to provide an interim Constitution. This means that the existing legislation was modified to establish a temporary framework for governance until a permanent constitution could be formulated.

Option 2 states that India ceased to be a dependency. This statement is incorrect, as the Indian Independence Act actually resulted in the end of British rule in India and the establishment of India as an independent dominion within the British Commonwealth.

Option 3 states that the Crown was the source of authority until a new Constitution was formed. This means that the British Monarch remained the symbolic head of state until India drafted and adopted its own constitution, marking the transition to a republic.

Option 4 states that the Governor General was the constitutional head of the Indian Dominion. This statement is correct, as the Indian Dominion, which later became the Republic of India, had a Governor General as its constitutional head until the office was abolished and replaced with a President.

In conclusion, the correct answer is option 2, as India did not cease to be a dependency but rather gained independence from British