The Most Active Galactic Nuclei Are Usually Found at Large

The most active galactic nuclei are usually found at large distances from us;relatively few nearby galaxies have active galactic nuclei.What does this imply?

A) Supermassive black holes existed only when the universe was young and no longer exist today.
B) Active galactic nuclei tend to become less active as they age.
C) Active galactic nuclei can form only at large distances from the Milky Way.
D) The jets seen in many active galactic nuclei must cause them to move far away from us.

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