When Quasars "Shine" (In Visible Light and Other Kinds of Radiation)

When quasars "shine" (in visible light and other kinds of radiation) with a lot of energy, where (what location) does this huge amount of energy come from?

A) from the outer spiral arms of the galaxy in which the quasar is located
B) from inside the event horizon of a supermassive black hole
C) from supernova explosions (a whole bunch of them all at once) in the galaxy in which the quasar is located
D) from an accretion disk around a supermassive black hole
E) from a much more distant object that happens to lie behind the quasar and fools us into thinking the quasar is shining