Which of the following is not a language of Bastar region?

Gondi
Halbi
Bhatri
Sadari

The correct answer is D. Sadari.

Gondi is a Dravidian language spoken by the Gond people of central India. It is the official language of the Bastar district of Chhattisgarh.

Halbi is a language spoken by the Halbi people of central India. It is a mix of Gondi and Hindi.

Bhatri is a language spoken by the Bhatra people of central India. It is a mix of Gondi and Telugu.

Sadari is a language spoken by the Sadari people of central India. It is a mix of Gondi and Marathi.

Gondi, Halbi, and Bhatri are all languages of the Bastar region. Sadari is not a language of the Bastar region.