Which is an example of the strong force in action?

A.) A battery-powered radio produces sound.

B.) A magnet keeps a cabinet door closed.

C.) The Sun pulls on Earth as Earth moves around the Sun.

D.) The protons in the nucleus of a carbon atom are held together.

The correct answer is D.

There are four fundamental forces in nature namely strong nuclear force, electrostatic force, gravitational force and weak nuclear force.

Out of all, the strong nuclear force also called strong force is the strongest of all. It is the force that binds the nucleons together in a nucleus.