Explanation:

- Varkala: Famous for its stunning cliffs and serene beach, Varkala is located in Kerala.

- Chowara: Another picturesque beach, Chowara, lies in Kerala, close to the famous beach town, Kovalam.

- Chavakkad: Known for its tranquil atmosphere and lovely views, Chavakkad Beach is situated in Kerala.

- Nattika: Located in the Thrissur district, Nattika Beach is also a part of Kerala's coastline.

- Option 1, Tamil Nadu: While known for its cultural significance and some beaches, none of the mentioned beaches are in Tamil Nadu.

- Option 2, Maharashtra: This state is famous for beaches like Juhu and Marine Drive, but again, not the ones listed here.

- Option 3, Karnataka: Has its own share of beautiful beaches, but the mentioned beaches are not part of Karnataka.

- Option 4, Kerala: All mentioned beaches—Varkala, Chowara, Chavakkad, and Nattika—are in Kerala.