Answer:
B ) position
Explanation:
moving object can have a constant speed ,constant acceleration and no change in the applied force
(when there is no applied force on the object ,it keep its motion uninterruptedly - Newton's first law of motion )
But if an object is moving , it must change its position as if it is still remain in the same position , there can never be a motion at all
b.
Motion is define as a change in its position. All the other answer might be changing, but do not have to be.