The white dwarf is a type of compact star that is generated when nuclear fuel with a mass of less than 9.10 solar masses has been used up.
This is a stage, and through this stage all the stars will pass, including the Sun (Remember that the sun is a star). This type of star is one of the most abundant.
Given this information we can say that the correct answer is option C.
When such as star begins to exhaust its fuel, it expands into a red giant because it begins to burn helium rather than hydrogen. When the helium is exhausted and it cannot burn carbon, a planetary nebula is formed when the fuel is exhausted. A white dwarf is left behind as remnants which begins to cool down over millions of years.
