The correct option is The rotation of the earth.
Explanation
In the Continental Drift Theory, Alfred Wegener proposed two primary forces to explain the movement of continents: the Tidal Force and the Pole-fleeing Force (also known as Polflucht). These forces were suggested to drive the drift of continental masses over geological time.
Analysis of the Force:
- The Pole-fleeing force is attributed to the rotation of the Earth.
- The Earth is not a perfect sphere; it is an oblate spheroid with a bulge at the equator. This shape is maintained by the centrifugal force generated by the Earth's rotation.
- Wegener hypothesized that this centrifugal force created a tendency for the continental crust to move from the higher latitudes (poles) toward the equator.
- In contrast, the Tidal Force (Option a) is caused by the gravitational pull of the moon and the sun, which Wegener believed was responsible for the westward drift of continents.
Key Takeaway:
The Pole-fleeing force is driven by the rotation of the Earth and the associated centrifugal force, causing a theoretical drift of continents toward the equator.