The correct answer to this question is B. If a rocket moves through empty space in a straight line with constant speed, far from the gravitational pull of any star or planet, this motion can be sustained with zero force applied to the rocket. This is an example of Newton's First Law of Motion.
The object in motion will remain in motion until some kind of force is applied to the rocket. Generally, that definition is associated with the term inertia. Before the rocket was in a constant motion, force may have been required for lift-off, illustrating that the amount of force needed to move an object can change.
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