The correct answer is option 4, Gondwana-land. The Indian Sub-continent, in its early formation, was part of a supercontinent called Gondwana. Gondwana existed during the Paleozoic and Mesozoic eras, from about 510 to 180 million years ago. It included the land masses that now make up South America, Africa, Antarctica, Australia, the Arabian Peninsula, and the Indian Sub-continent. Over millions of years, the Indian Sub-continent broke away and eventually collided with the Eurasian Plate, leading to the formation of the Himalayas. Option 1, Jurassic-land, is not accurate as the Jurassic period refers to a specific time period of the Mesozoic era, and not a landmass. Option 2, Angara-land, and option 3, Aiya-varta, are not correct as they do not correspond to any recognized land formations in relation to the Indian Sub-continent.