When a Supernova Explosion Results from Core Collapse in a Massive

Multiple Choice

When a supernova explosion results from core collapse in a massive star it appears to leave behind

A) a rapidly expanding shell of gas and a central neutron star or black hole.
B) a rapidly rotating shell of gas,dust,and radiation,but no central object.
C) a rapidly expanding shell of gas and a compact white-dwarf star at its center.
D) nothing,the explosion changes all the matter completely into energy,which then radiates into space at the speed of light.