Question

which kind of star explodes in a supernova and then forms a black hole? a massive stars b white dwarf stars c small stars

Explanation:

Based on the star - life cycle shown, massive stars (larger stars) become red super - giants, then explode in a supernova. After a supernova, under certain conditions, they can form a black hole. Smaller stars like the Sun become red giants and then white dwarfs and eventually black dwarfs. White dwarf stars do not explode in a supernova to form black holes.

Answer:

A. massive stars