Which Technique Has Been Successful in Identifying Good Candidates for a Black

Which technique has been successful in identifying good candidates for a black hole in the Milky Way Galaxy?

A) detection of extremely redshifted starlight from a region in the nearby spiral arm of the Galaxy
B) detection of X-rays from a binary star undergoing mass exchange, where masses of component stars can be determined
C) detection of an extremely dark point in the sky from which no light at all is seen
D) gravitational lensing of light from a distant object by the black hole to produce two identical images

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