How Do We Know That Pulsars Are Neutron Stars

How do we know that pulsars are neutron stars?

A) We have observed massive-star supernovae produce pulsars.
B) Pulsars and neutron stars look exactly the same.
C) No massive object,other than a neutron star,could spin as fast as we observe pulsars spin.
D) Pulsars have the same upper mass limit as neutron stars do.
E) none of the above

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