Concept:Inertia is the natural tendency of a body to resist any change in its state of rest or uniform motion.
Explanation:This property is described by Newton's first law of motion.
A body at rest stays at rest unless an external unbalanced force acts on it.
A body in uniform motion continues moving in a straight line at constant speed unless acted upon by an external unbalanced force.
This resistance to any change in motion is called inertia.
Inertia depends on the mass of the body.
A heavier body has greater inertia and is harder to start or stop moving.
The statement given in the question exactly defines inertia.
Answer:B. Inertia