The Munda tribe is primarily concentrated in the Chhota Nagpur Plateau region, which covers parts of present-day Jharkhand, Odisha, West Bengal, and Chhattisgarh. This region has been their traditional homeland for centuries. Option B (Bastar) is in Chhattisgarh but is more associated with tribal groups like the Gonds and Maria tribe, while Durg is a city and Kullu is in Himachal Pradesh, neither being traditional Munda areas.