Question

the core that remains after a supernova is know as a ______. blackhole giant nebula neutron star protostar star super giant supernova white dwarf

Explanation:

A supernova is a powerful stellar explosion. After a supernova, the remaining core can be a neutron star (or a black hole in more massive cases). Among the options, a neutron star is a remnant of a supernova. A black hole can also be a remnant, but "neutron star" is a more typical and common remnant for many supernova events (and is one of the standard options here). Other options like giant, nebula, protostar, star, super giant, supernova (the explosion itself, not the remnant), white dwarf (from lower - mass stars, not supernovae) don't fit as the core remnant of a supernova.

Answer:

A. blackhole, D. neutron star