In outer space, a piece of rock continues moving at the same velocity for thousands of years. What makes this possible? A. Inertia B. Acceleration C. Force D. Air resistance

A. because none of the other answers make sense, there is no air in space, acceleration would change the velocity, force would imply something moved it which is highly unlikely (unless we are talking about starwars), and inertia is a tendency to do nothing or to remain unchanged or a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force.