An artificial satellite orbiting around the Earth does not fall down. This is so because the attraction of Earth

(a)

does not exist at such a distance.

(b)

is neutralized by the attraction of the moon.

(c)

provides the necessary speed for its steady motion.

(d)

provides the necessary acceleration for its motion.

Option (d) is correct: Satellites orbit Earth due to centripetal acceleration, which balances the gravitational pull.