Which sequence describes the life of a sun-like star as listed?

• A. nebula -> sun-like star -> red giant -> white dwarf -> black dwarf -> supernova
• B. nebula -> red giant -> sun-like star -> white dwarf -> black dwarf -> supernova
• C. nebula -> sun-like star -> white dwarf -> red giant -> black dwarf -> supernova
• D. nebula -> sun-like star -> red dwarf -> white dwarf -> black dwarf -> supernova

Answer: (A)

The sequence follows how a sun-like star actually evolves: it forms from a nebula, then becomes a sun-like main-sequence star, later expands into a red giant as its core runs out of hydrogen, then sheds outer layers and leaves behind a white dwarf, which over a long time cools to a black dwarf. This progression captures the key transitions in brightness, size, and internal structure that define the life of a relatively small star. The idea of a supernova is not a typical fate for sun-like stars (that explosive end belongs to much more massive stars), so while the final stage in this sequence isn’t what usually happens, the earlier steps—and their order—fit the sun-like life cycle best among the options. Other choices mix up the stages or swap star types, which doesn’t align with how sun-like stars actually develop.