India is still a virgin land exploring its tourism potential.

The correct answer is unexplored.

• Undone means not finished or completed. This does not make sense in the context of the
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  sentence, as India is a country that has been explored by many people.
• Uncouth means rude or ill-mannered. This does not make sense in the context of the sentence, as India is a country with a rich culture and history.
• Unexploited means not used or taken advantage of. This is the closest answer to the correct answer,
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  but it does not capture the full meaning of the sentence. India is a country with a lot of potential for tourism, but it has not been fully explored by tourists.

Therefore, the correct answer is unexplored.