What is the best evidence for an extremely massive black hole in the center of the Milky Way?a. The orbits of stars in the center of the galaxy indicate that the presence of an approximately 4 million solar mass object in a region no larger than our solar system.b. The center of our galaxy hosts a pulsar that is spinning so fast that it could only be a black hole.c. Huge amounts of X-rays are pouring out of the center of the galaxy.d. We observe stars vanishing in the center of the Galaxy as they are sucked into the black hole.

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