Why Are Neutron Stars Called "Neutron Stars

Multiple Choice

Why are neutron stars called "neutron stars"?

A) They are new versions of old stars; "Neu Tron" means " New Star" in Hungarian.
B) They are so dense that protons and electrons fuse to form neutrons.
C) They appear to emit short pulses of radio waves.
D) They are composed of neutrons gathered from the surrounding nebula by the terrific gravity of the neutron star. Electrons and protons, being less massive, aren't as likely to be pulled in.