Explanation:

- Chhath Puja:

- This is the correct answer.

- This festival is primarily celebrated in Bihar, Jharkhand, and eastern Uttar Pradesh.

- It is devoted to the worship of the Sun God and Shashthi Devi.

- Bohag Bihu:

- This festival is celebrated mainly in Assam.

- It marks the Assamese New Year and the arrival of spring.

- Ugadi:

- This is the New Year festival celebrated in Andhra Pradesh, Telangana, and Karnataka.

- It marks the beginning of the Hindu lunar calendar.

- Lohri:

- This festival is mainly celebrated in Punjab.

- It marks the end of winter and the beginning of the harvest season.