Which Observational Fact About Quasars and Their Behavior Is Perhaps

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

A) velocities of recession of up to 9/10 of the speed of light
B) distances from the Sun of up to 18 billion ly
C) incredibly powerful radio emitters, such that simple receivers can detect them, from vast distances across the universe
D) energy output equivalent to 1000 galaxies from a volume as small as our planetary system

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