I believe your answer would be A- Farmers and urban dwellers.
Hope this helps. Correct me if I'm wrong.
Be more specific, in order to answer this question.
The air around you has weight, and it presses against everything it touches. That pressure is called atmospheric pressure, or air pressure. It is the force exerted on a surface by the air above it as gravity pulls it to Earth. Atmospheric pressure is commonly measured with a barometer.
The rivers will go both north and sounth
