Which statement is true about black dwarfs?
A. None currently exist in the universe.
B. They are very hot and massive.
C. They burn brightly for only a few weeks or months.
D. They form after supernova explosions. ...?

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lr1265
Currently, there are no black dwarfs that exist in our universe. Black dwarfs are extremely cool and are almost invisible. They are hypothetical in existence. 

Answer:

A. None currently exist in the universe.

Explanation:

It is true that the black dwarfs will be burn brightly for only few weeks or months, and they are going to be very hot and not so massive, and it is going to appear after a white dwarf, but by now, there is just a theory that scientist use, because there is any observation of them.