The correct answer is option 4, "Union of States."

The Cabinet Mission Plan for India was a proposal put forward by the British government in 1946. It aimed to address the growing demand for independence in India and find a way to peacefully transfer power from the British to the Indian people.

The plan proposed the establishment of a "Union of States" in India. This meant that India would be a united country made up of different states with some degree of autonomy. The states would have their own governments and certain powers would be devolved to them, while the central government would have authority over matters of national importance.

This option is correct because it accurately describes the vision outlined in the Cabinet Mission Plan. It is important to note that this plan was not ultimately implemented exactly as proposed, but it provided a framework for the subsequent development of the Indian constitution and the establishment of India as a federal republic.