Dai people mainly lived in ___________ of Yunnan Province.

A、Gengma, Menglian and Xinping Counties;
B、Xishuangbanna Autonomous Prefecture, Dehong Dai-Jinpo Autonomous Prefecture, Gengma, Menglian and Xinping Counties;
C、Dehong Dai-Jinpo Autonous Prefecture;
D、Xishuangbanna Autonomous Prefecture