* Inertia is the tendency of an object to resist changes in its motion. The more massive an object is, the greater its inertia.

Let's compare the objects:

* Bowling ball: The bowling ball is the most massive of the options.

* Tennis ball, Volleyball: These are relatively light compared to a bowling ball.

* Beach ball: This is the lightest and therefore has the least inertia.

Therefore, the bowling ball, being the heaviest, has the greatest inertia.