Why are there no nearby (and thus "young") quasars?
A) Eventually, most of the accretion disk falls into the black hole and the "central engine" runs out of fuel.
B) The central black hole eventually consumes the entire galaxy, and with no more matter in the vicinity, it becomes dormant until another galaxy happens to pass nearby.
C) The continual infall of material causes the mass of the black hole to grow until it explodes, resulting in a supernova.
D) The immense radiation output from the quasar carries away energy. The mass of the black hole gets smaller until it evaporates.
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