cool ocean currents circulating towards the equator increased volcanic activity in the upper latitudes cold air moving south from the North Pole warm water temperatures in the tropics
I gave my students this multiple choice question: When air rises over the open ocean, a low pressure system is formed. Which factor increases the potential of a low pressure system developing into a hurricane in the Northern Hemisphere?

Only one answer is correct among these 4 choices:
- cool ocean currents circulating towards the equator
- increased volcanic activity in the upper latitudes
- cold air moving south from the North Pole
- warm water temperatures in the tropics

Could you tell me which one is correct?

warm water temperatures in the tropics