None of the Pulsars Emit Visible Light Because

Multiple Choice

None of the pulsars emit visible light because

A) pulsars are too hot to emit visible light.
B) pulsars contain black holes that won't let visible light escape.
C) the gravitational field of a pulsar is so great that the visible light emitted is red shifted.
D) pulsars are too far away for the visible light to be bright enough to be detected at Earth.
E) The premise is false.A few pulsars are known to emit visible light pulses.