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 a different country.

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

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