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What is the Schwarzschild radius?
O A.
a measurement of how quickly black holes accrete objects based on the objects' radii
OB.
a measurement of how long a black hole's quasar extends into the universe
O. C.
a measurement of how small a celestial body's radius would have to be in order to become a black hole
OD.
the point at which the radius of a black hole lends to its classification as a supermassive black hole