Most Active Galactic Nuclei Are Found at Large Distances from Us,with

Most active galactic nuclei are found at large distances from us,with relatively few nearby.What does this imply?

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

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