Which force is strongest among the four at the level of quarks?

Quarks are held together by the color force, the fundamental strong interaction. This force is so strong that isolated quarks are not observed under normal conditions, a phenomenon known as confinement. Gluons carry the force and also interact with one another, making the theory highly complex. The strong force is the basis for almost all visible matter because it creates stable protons and neutrons. It is one of the deepest and most distinctive forces in physics.