The correct answer is option 1, Cheetah. Cheetahs became extinct in India a few decades ago and there is now a proposal to re-introduce them.

Let`s explore the other options. Option 2, Gharial, is a critically endangered species of crocodile that is found in the Indian subcontinent. While their population has declined significantly, they are not extinct in India.

Option 3, Saltwater crocodile, is found in India`s coastal regions and is not extinct. They are a species of crocodile that live in saltwater habitats and are known to be the largest living reptiles.

Option 4, Snow leopard, is a highly elusive and endangered big cat species that is found in the mountainous regions of Central and South Asia, including India. While the population of snow leopards has been declining, they are not extinct in India.

Therefore, the correct option is 1, Cheetah, as they are the species that became extinct in India and are proposed to be re-introduced.