Question

what will a medium - mass star become at the very end of its life cycle?
○ a red giant
○ a black hole
○ a black dwarf
○ a neutron star

Explanation:

Medium - mass stars (with an initial mass of about 0.4 - 8 times the mass of the Sun) eventually shed their outer layers and leave behind a dense core. This core cools down over time and becomes a black dwarf. A red giant is an intermediate stage in the life - cycle of a star before it sheds its outer layers. A neutron star and a black hole are formed from much more massive stars.

Answer:

a black dwarf