Millisecond Pulsars That Are Very Old Are

Multiple Choice

Millisecond pulsars that are very old are

A) believed to be the result of mass transfer from a companion that increased the spin of the pulsar.
B) all single objects.
C) not spinning as rapidly as they seem because they have four hot spots that produce the flashes.
D) X-ray binaries.
E) gamma-ray bursters.