Concept:A satellite remains in orbit because the gravitational pull of the Earth supplies the necessary centripetal force.
Explanation:For a satellite moving in a circular orbit, the force directed toward the centre of the Earth is called centripetal force.
This force is provided by the gravitational attraction between the Earth and the satellite.
Centripetal force prevents the satellite from flying off in a straight line.
Centrifugal force is an apparent force that appears only in a rotating frame of reference; it is not a real force acting on the satellite.
In space, friction is negligible and does not help in maintaining the orbit.
Hence, the satellite is kept in its orbit by centripetal forces alone.
Answer:A. Centripetal forces only