The importance of Newton's first law of motion is that:
The correct options is A
As we know, Inertia α mass, mass represent the presence of inertia.
we can also say that
(1) more mass more inertia, bigger force required to start/stop motion in a body.
(2) less mass less inertia, smaller force required to start/stop motion in a body.
(3) no mass no inertia.