The best choice is uneven heat distribution because If a place has a warm are it has low pressure and if it has a cold area it has high pressure. Wind moves from areas of high air pressure to low air pressure. Example: Land Breeze and Sea Breeze. Th earth has uneven distribution due to different angles of insolation and by earth tilts.
Wind circulation is defined as the flow of air from one place to another. This occurs due to uneven heating of air as increase in temperature raises the kinetic energy of molecules. As a result, warm air moves more rapidly.
Whereas in cold air molecules do not have enough kinetic energy. Hence, they move at slow speed.
Therefore, we can conclude that the main reason for wind or air circulation is uneven heat distribution.
