The correct answer is option 3: Rotation of the Earth.

Explanation:

The deflection of planetary wind is caused by the rotation of the Earth. This phenomenon is known as the Coriolis effect. As the Earth rotates on its axis, it causes air to be deflected in a curved path instead of moving directly from high-pressure areas to low-pressure areas.

The Coriolis effect is a result of the combination of the Earth`s rotation and the movement of the air. Due to the rotation of the Earth, different latitudes travel at different speeds. The air at the equator moves fastest, while the air at the poles moves slowest. This difference in speed causes the air to be deflected to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.

Option 1: Latitudinal variation in temperature is not the primary cause of the deflection of planetary wind, although it does contribute to the overall atmospheric dynamics.

Option 2: The revolution of the Earth around the sun affects seasonal variations in temperature but does not directly cause the deflection of planetary wind.

Option 4: While the difference in atmospheric pressure does play a role in the movement of air, it is not the primary cause of the deflection of planetary