When Amelia apply brakes the car will start reducing its speed and then finally stop
So here as per Newton's First law we can say all object continue its state of motion until and unless some unbalanced external force act upon its.
This property is due to inertia of the object which is the property of mass. Here inertia is the property which resist the change in state of motion of an object.
If brakes are applied and an object stops after some time (let say t = 5 s) and on applying brakes other object stop in other time (let say t = 10 s) then if other object took longer time to stop then it means its inertia will be more.
So its all depends on inertia of object that how much time it will take to stop after applying brakes
So correct answer is
B. inertia