Which Amazing Observational Fact About Quasars and Their Behavior Is

Which amazing observational fact about quasars and their behavior is perhaps the MOST extraordinary?

A) Quasars have incredible power as radio emitters, such that simple receivers can detect them from vast distances across the universe.
B) Quasars have an energy output equivalent to more than 100 ordinary galaxies from a volume as small as our planetary system.
C) The distance of quasars from the Sun is up to 18 billion ly.
D) The recession velocities or quasars can be up to 9/10 of the speed of light.

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