Question

what lies at the very center of our galaxy? the sun a supermassive black hole a clump of dark matter absolutely nothing

Explanation:

Observations and studies in astronomy indicate that at the center of our Milky - Way galaxy lies a supermassive black hole named Sagittarius A*. It has a huge mass and its gravitational influence affects the motion of nearby stars. The Sun is located in one of the spiral arms of the galaxy, dark matter is distributed throughout the galaxy but not concentrated in the center as the main object there, and there is definitely not nothing at the galactic center.

Answer:

B. a supermassive black hole