What Is the Best Evidence That Sagittarius A* Is a Black

What is the best evidence that Sagittarius A* is a black hole at the centre of the Milky Way galaxy?

A) Orbits of stars indicate a mass several million times that of the Sun within a very small volume.
B) Sagittarius A* is a powerful radio source.
C) No visible light from Sagittarius A* reaches the Earth.
D) Radio maps of the region around Sagittarius A* show complicated gas structures believed to be related to massive star formation.

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