Explanation:

- Option 1, Gravity : Once in orbit, a satellite is primarily influenced by the gravitational pull of the Earth. This force keeps the satellite in its orbital path, balancing its forward velocity with the gravitational attraction.

- Option 2, Elasticity: Elastic forces are not relevant in the context of a satellite's orbit. Elasticity pertains to materials returning to their original shape after deformation, unrelated to orbital mechanics.

- Option 3, Friction: In space, there is almost no air to create friction. Thus, satellites experience negligible atmospheric drag, making friction an irrelevant factor for their motion in orbit.

- Option 4, Fuel Driven: Fuel is primarily used for adjustments in position or speed. Once a satellite is in stable orbit, its motion is not continuously driven by fuel.