Explanation:

- Kaveri Sankramana is a festival celebrated primarily in Karnataka, especially in the Kodagu district.

- The festival marks the reappearance of the sacred river Kaveri at a place called Talakaveri.

- It is observed with religious fervor, rituals, and offerings, signifying the sacredness and cultural significance of the river.

- Option 1, Telangana: The region has its own set of festivals, but Kaveri Sankramana is not one of them.

- Option 2, Andhra Pradesh: Although neighboring Karnataka, this festival is not primarily celebrated here.

- Option 3, Tamil Nadu: While having its share of cultural festivals, Kaveri Sankramana is not celebrated here in a major way.

Correct Answer: Option 4 - Karnataka