What Is the Best Evidence for a Supermassive Black Hole

What is the best evidence for a supermassive black hole in the center of the Milky Way Galaxy?

A) amazing filaments of radio emission swirling around the center of the galaxy
B) the gigantic bursts of X- ray energy from a mysterious dark object
C) The existence of the Milky Way itself: The mass of the black hole is essential to gravitationally bind the galaxy together, so it doesn't fly apart.
D) the motions of stars around a mysterious dark object

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