The correct answer is (c) 12 Nautical miles.
The territorial waters of India extend up to 12 nautical miles from the baselines from which the breadth of the territorial sea is measured. The baselines are the low-water line along the coast as marked on large-scale charts officially recognized by the Government of India.
The territorial sea is a belt of sea adjacent to the coast of India. It is under the full sovereignty of India. The Government of India has the exclusive right to exploit all the natural resources of the territorial sea, including the seabed, subsoil, and superjacent waters.
The territorial sea also includes the airspace above it and the seabed and subsoil beneath it. The Government of India has the exclusive right to construct artificial islands, installations, and structures in the territorial sea.
The territorial sea is a part of the Indian State territory and is subject to the same laws and jurisdiction as the land territory of India.