How are galaxies and quasars related?
A) quasars can be seen in front of galaxies, but they have nothing to do with them
B) quasars can only be seen behind galaxies, but they have nothing to do with them
C) quasars and galaxies are never seen together and they have nothing to do with each other
D) quasars are active supermassive black holes at the centers of galaxies
E) quasars are a complete mystery; so it is not possible to say how they might be related to galaxies
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