Final answer:
When the force on an object increases, its linear inertia also increases.
Step-by-step explanation:
When the force on an object increases, so does its linear inertia. Linear inertia refers to the tendency of an object to resist changes in its linear motion. This means that an object will resist changes in its speed or direction of motion when a force is applied to it.
For example, if you push a heavy object with a greater force, it will take more effort to accelerate or decelerate the object compared to pushing it with a smaller force.
Therefore, the correct answer is option c. Linear.