Correct Answer: (d) tribal languages
Solution:Halbi, Ho and Kui are the languages of the tribes. The Halbi language is mainly of Bastar, Chhattisgarh, its speakers are the Rajmuria, Halba, Mahar, Parja, Lohra tribes spread from Odisha to Maharashtra. Ho is the language of the Munda family, which is spoken by tribe like Ho, Munda, Koi etc. It's main area is West Singhbhum, Jharkhand, while the speakers spred from Odisha to Maharashtra. Kui is the language to the Dravidian family. It is mainly spoken by the Kui tribe in Kandhamal, Odisha.