What Makes Us Think That the Star System Cygnus X-

What makes us think that the star system Cygnus X- 1 contains a black hole?

A) Cygnus X- 1 is a powerful X- ray burster, so it must contain a black hole.
B) The fact that we see strong X- ray emission tells us that the system must contain a black hole.
C) No light is emitted from this star system, so it must contain a black hole.
D) It emits X- rays characteristic of an accretion disk, but the unseen star in the system is too massive to be a neutron star.

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