Description:

The correct answer is:

Deflection due to Earth's rotation

Explanation:

The Coriolis effect is caused by the rotation of the Earth and results in the deflection of moving air (and other fluids) relative to the surface of the Earth.

In the Northern Hemisphere, this deflection is to the right, causing cyclones to rotate counterclockwise.

In the Southern Hemisphere, the deflection is to the left, so cyclones rotate clockwise.

This deflection affects both cyclones (low-pressure systems) and anticyclones (high-pressure systems), influencing their rotation patterns.

Gravitational pull and solar radiation affect weather in general but are not the cause of the Coriolis effect.