When an object distance is increasing or decreasing in reference to a point, that means that the object is in motion. Option B is the correct answer.
When an object's distance from another object is changing it must be in motion.
When an object's distance from another object is changing it may be accelerating or decelerating. So, we can really say it is accelerating.
When an object is moving fast, the direction at which it is moving will determine if the distance will be reducing or increasing.
When an object's distance from another object is changing it will never be at rest.
But when an object's distance from another object is changing it must surely be in motion.
Therefore, the correct answer is option B
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