Acollege student has been assigned to write captions for a new textbook on gravity and motion. this is one of the pictures from the textbook.

which caption best describes the thinner arrow?

the moon moves toward the sun due to gravity.
the moon will move away from earth because of inertia.
the moon would move in a circular path if there were no forces.
the moon would not stay in orbit without the pull of earth's gravity.