Astronomers Believe That the Center of Our Galaxy Has a Black

Astronomers believe that the center of our Galaxy has a black hole with enough mass inside to make almost 4 million Suns! How do astronomers think a black hole could acquire so much mass?

A) the Galaxy formed from one supergiant star, and most of what is left of it is now in the black hole
B) the black hole at the center is really another galaxy that our Milky Way swallowed; none of its material comes from our own Galaxy
C) the center of our Galaxy is a much more crowded region than where the Sun is found; we still see material falling toward the center and material has fallen in for billions of years
D) this black hole contains only dark matter, and we know dark matter is concentrated toward the center of our Galaxy; none of it can be found near the outer regions of the Milky Way
E) no one can think of a way to make a black hole this massive; that's why most astronomers are skeptical about the observations that indicate that our Galaxy has such a black hole
Section 25.5: Stellar Populations in the Galaxy