Question

which object forms when a supergiant explodes? a red giant a protostar a white dwarf a neutron star

Explanation:

A red giant is a late - stage of a lower - mass star (not a supergiant explosion result). A protostar is an early stage of star formation. A white dwarf is the remnant of a low - to medium - mass star. When a supergiant explodes (supernova), if the core mass is between about 1.4 and 3 times the mass of the Sun, it forms a neutron star.

Answer:

a neutron star