The correct option is C It prevents illegal sea trade and smuggling.
The Indian Coast Guard was formed as a para-military force in 1978. They have various ships to protect the borders: Puthar, Vikram, Vijay, and Veera, to name a few. They work closely with the Indian Navy. They prevent illegal sea trade and smuggling. The unit is headed by the Director-General and is headquartered in New Delhi.
There are four regional headquarters located at Mumbai, Chennai, Gandhinagar, and Port Blair in Andaman and Nicobar Islands.