Are chinese americans that overlap social and welfare services that include settling disputes, aiding new arrivals from their region, and developing mutual aid networks.

I believe the answer is: Huiguan

 huiguan typically has higher income even if compared to white citizens. Because of this, they could afford to create the social and welfare services for the exclusive members (only chinese Americans). On top of that, they also take some amount of annual payment  from the members to help sustain their community. 

D. providing for public safety