Why Do Astronomers Believe That Supermassive Black Holes Are the Source

Why do astronomers believe that supermassive black holes are the source of energy for active galactic nuclei?

A) Such black holes have been found at the centre of most galaxies, both active and inactive.
B) Radio jets are seen from low mass black holes plus accretion disks inside our galaxy.
C) Jets and accretion disks have been observed in active galaxies.
D) Only black holes can produce so much energy in such a small region.

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