Answer:
gravity
Step-by-step explanation:
Earth Motion in Centripetal direction is due to the centripetal force on the Earth.
As we know that Earth revolves around the sun with the force on Earth due to the Sun towards it.
If we assume the motion of Earth to be circular motion around the Sun then the force due to which Earth maintains its circular trajectory is known as Centripetal force.
Here this centripetal force is the gravitational force of Sun towards it
So correct answer would be
GRAVITY