Mesons Are Particles That Mediate the Strong Nuclear Force $\backsim$ 15 Fm Between Two Nucleons in the Nucleus

Mesons are particles that mediate the strong nuclear force. They are thought to travel at near the speed of light and exist over a distance of $\backsim$ 1.5 fm between two nucleons in the nucleus. The mass of the mesons is of the order

A) 10 MeV/c².
B) 150 MeV/c².
C) 550 MeV/c².
D) 1000 MeV/c².
E) 3000 MeV/c².