Awhite dwarf is a small star before it enters the main sequence stage the stage after a red giant finishes nuclear fusion a star that is about to become a black hole a small black hole

The correct answer is the stage after a red giant finishes nuclear fusion

A white dwarf can be defined as a star that has completed its nuclear fusion. This is a type of star which is at the stage of completion of its nuclear burning , it expels its outer material which creates a planetary nebula. The core of star becomes hot and white in color. It takes millions of year for its cooling.