The Coriolis Effect primarily influences the rotation of hurricanes and cyclones. Therefore, the correct answer is:
A. determines the direction of the wind rotation
The Coriolis Effect causes storms in the Northern Hemisphere to rotate counterclockwise, while in the Southern Hemisphere, they rotate clockwise. This effect is crucial for the formation and development of tropical cyclones but does not directly determine their intensity (B), track (C), or location of formation (D).