The Rest Energies of Three Subatomic Particles Are: Particle X

The rest energies of three subatomic particles are: Particle X: 107 MeV; Particle Y: 140 MeV; Particle Z: 0.51 MeV.
Which one of the following statements is necessarily true concerning these three particles?

A) Particle Z, at rest, could decay into particle X and give off electromagnetic radiation.
B) Particle X, at rest, could decay into particle Y and give off electromagnetic radiation.
C) Particle X, at rest, could decay into particles Y and Z and give off electromagnetic radiation.
D) Particle Y, at rest, could decay into particles X and Z and give off electromagnetic radiation.
E) Particle Z, at rest, could decay into particles X and Y and give off electromagnetic radiation.