Question

a 1 m$_{\text{sun}}$ star will end its life as a
white dwarf.
black hole.
planet.
brown dwarf.

Explanation:

Stars with a mass similar to the Sun (around 1 $M_{sun}$) eventually shed their outer layers and leave behind a dense core known as a white - dwarf. Black holes form from much more massive stars, planets are not the end - stage of stars, and brown dwarfs are sub - stellar objects that never really became full - fledged stars.

Answer:

white dwarf.