Concept:The attractive force that binds protons and neutrons inside the atomic nucleus is known as nuclear force.
Explanation:Nucleons are the protons and neutrons present in the nucleus.
Protons are positively charged, so they naturally repel each other through electrostatic force.
If only electrostatic force acted, the nucleus would fly apart.
A much stronger attractive force acts between all nucleons, keeping the nucleus stable.
This force is called the nuclear force or strong nuclear force.
It acts over a very short range and is one of the fundamental forces of nature.
Therefore, the force of attraction between nucleons is not gravitational, electrostatic, or magnetic, but nuclear force.
Answer:D. Nuclear force.