The correct answer is D) from south to north.
A local wind is felt to be blowing from north to south at ground level. At the top of the convection cell, the wind is felt to be blowing from south to north.
In scientific terms, we are talking about the system to warm a fluid to lose its density. In the atmosphere of the Eart, convection cells make the wind blows. The classic example of convection cells in the atmosphere of the earth is the sea breeze. The air on the earth warms faster than the air above the water when the Sun rises. That is how the sea breeze is formed during the day.
