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Christopher June 15, 2018
@EmilyMarieMenendezYou're second interpretation is correct. "Any longer" is taken to mean "no longer exists." (E) which reads, "No quasar that has ever been seen from Earth exists any longer" can just as accurately be read "Any quasar that has ever been seen from Earth no longer exists."
What seems to be tripping you up is the language "exists any longer" could continue "exists any longer than a particular amount of time," but you've got to remember that all that matters is exactly what's written on the page. Don't add a "than" to the end of the statement, because there isn't a "than" there. Does that make sense?