Scientists describe motion of an object in relation to force out of the given options.
Answer: Option B
Explanation:
Force is defined as an interaction between two or more things that when unopposed, causes the objects to move. To move an object, force is the prime thing without which, nothing can change its state either at rest or moving.
Gravitational pull is yet another form of force and mass plays a supplementary role to the gravitational force because it attracts things having mass. Any other object can change the state of an object either from rest to motion or moving to rest position only by applying force.
So, force is also present there. Hence, we can conclude our answer as option B because in all scenarios, we can see that force is the main for the motion of an object.