The Key to Identifying a Black Hole Candidate in a Binary

The key to identifying a black hole candidate in a binary system is that:

A) one of the two stars cannot be seen.
B) the unseen companion in the system must have a sufficiently high mass.
C) the unseen star is a contact binary.
D) the system must be a very strong source of radio emissions.
E) the visible companion must be an evolving main sequence or giant star.

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