This is an 'incorrect pair' question. Option C is the incorrect pair: Kanwar is a major tribe in Chhattisgarh, but Abhujmaria is not their sub-tribe. Abhujmaria are actually a sub-group of the Maria/Gond tribes. The other pairs are correct: Pardhan is a sub-tribe of Gond, Binjhbar is a sub-tribe of Baiga, and Kurukh is a sub-tribe of Oraon.