The correct answer is option 3, "Revolution of the earth." The revolution of the earth refers to its movement around the sun. While this motion does have an indirect influence on ocean currents through the annual variation in solar radiation, it is not a direct cause of the generation of ocean currents.

Option 1, "Planetary winds," is a cause of the generation of ocean currents. The wind patterns across the Earth`s surface, influenced by factors such as temperature and pressure differences, create daily and seasonal patterns of winds that can set ocean water in motion, generating currents.

Option 2, "Variation in ocean water temperature," is also a cause of the generation of ocean currents. Differences in water temperature create variations in density, and denser water tends to sink while less dense water rises. This movement, known as thermohaline circulation, drives long-term ocean currents.

Option 4, "Shape and configuration of the coastlines," is another cause of ocean currents. Coastlines can affect the direction and speed of ocean currents by creating obstacles or channels that either steer or restrict the flow of water.

In conclusion, while the revolution of the earth does have an indirect influence on ocean currents through solar radiation, it is not a direct cause. The direct causes of