The tectonic plates beneath the earth rsquo s crust are in a constant motion due to........

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The tectonic plates beneath the earth’s crust are in a constant motion due to

The rotational energy generated by earth’s rotation about its own axis.

The gravitational force exerted by the sun and moon and other celestial bodies.

The centrifugal force generated due to the revolution of earth around the sun.

The convection currents in the upper mantle generated due to heat gradient.

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Explanation:

Except for option d, other options are incorrect. These were some of the earlier explanations for plate movements which have been rejected now. Alfred Wegener talked about the pole fleeing force generated by earth’s rotation to explain movement of continental landmasses from Pangaea.
The tectonic plates move over the asthenosphere due to convective currents generated in the asthenosphere (upper mantle) due to temperature gradient.