In "black hole beginnings," what is described as an effect of a star up to nine times the mass of the sun running out of fuel?

it goes supernova.
it turns into a black hole.
it stays the same.
it turns into a white dwarf.

D. It turns into a white dwarf.

Explanation:

If the star is up to nine times bigger than the sun: the low-mass star never becomes a supernova. Instead, its inner core turns into a small, whitish ball of cooling material called a white dwarf. Every day you see a lightweight star that is destined to become a white dwarf: the Sun.