Which sentence below is true ? 

Câu hỏi: Which sentence below is true ? 

A Conflicts improve when a natural resource crosses political borders.

B The source of a main river may be located in the country through which the river flows than s different country.

C The way where one ordinary source is managed has a direct effect upon other ordinary sources .

D There is assurance that river source will be confined to provide accommodation for resource needs downstream .