Question

Giant stars evolve faster than smaller stars do, and they have a hotter core that creates heavier elements through fusion. When the core collapses in giant stars, due to their own gravity, they explode and violently blow the outer layers away from the core, resulting in
A.
a supernova.
B.
a white dwarf.
C.
a red giant.
D.
a nebula.

Answer 1

A. a supernova.

When the core of a massive (giant) star collapses, the star undergoes a core-collapse supernova, violently ejecting its outer layers. (The expelled material later forms a nebula/supernova remnant.)