C. 区域办事处向驻地协调员提供了跨界应对方面的有益支助，但由于问题的复杂性和区域办事处能力有限，这些支助受到限制所有五个区域办事处都通过各种方式支助驻地协调员开展跨界应对工作
C. Regional offices have provided helpful support to resident coordinators on transboundary responses, though their support has been limited by the complexity of the issues and regional office capacity Through various means, all five regional offices have supported resident coordinators on transboundary responses