Question

which type of star will become a black hole when it dies?
○ a protostar
○ a supergiant
○ a white dwarf
○ a red dwarf

Explanation:

Protostars are pre-main sequence stars, not dying stars. White dwarfs are the final core remnant of low-to-medium mass stars, not precursors to black holes. Red dwarfs are small, low-mass stars that will fade to white dwarfs. Only supergiants, which are extremely massive stars (typically 20+ times the mass of our Sun), have enough mass that their core collapses completely under gravity at the end of their life, forming a black hole.

Answer:

b. a supergiant