the length of the river the slope of the land the type of rock over which the water flows the location of the North Pole
I gave my students this multiple choice question: The direction water flows in a river depends on

Only one answer is correct among these 4 choices:
- the length of the river
- the slope of the land
- the type of rock over which the water flows
- the location of the North Pole

Could you tell me which one is correct?

the slope of the land