Which of the Following Is Not a Piece of Evidence

Which of the following is not a piece of evidence supporting the conclusion that active galactic nuclei are powered by accretion disks around massive black holes?

A) Radio observations sometimes show long jets of material that can extend millions of light- years out from the galactic center.
B) Spectral lines from the galactic center indicate that clouds of gas are orbiting a central object at very high speed.
C) Infrared observations show that many stars are forming near the centers of active galaxies.
D) The total amount of radiation coming from the galactic center can, in some cases, exceed 100 times the total luminosity of the Milky Way Galaxy.
E) Observed radiation from the galactic center can vary significantly in brightness in times as short as a few days.