According to the Consensus Among Those Scientists Who Have Studied

Multiple Choice

According to the consensus among those scientists who have studied the question, what is the scientific status of the notion that Earth is now or was in the past visited by extraterrestrial life?

A) Although extraterrestrial life is implausible on general theoretical grounds, there is observational evidence for it.
B) Although extraterrestrial life is theoretically plausible, and there is observational evidence for it, most scientists still will not accept the conclusion that we have been visited because it seems too unconventional or "kooky."
C) Extraterrestrial life is implausible on general theoretical grounds, and there is no real evidence that Earth has been visited by extraterrestrials.
D) Extraterrestrial life is theoretically plausible, and there is real observational evidence for it, which is why most scientists believe that we have been visited.
E) Although there is no real evidence that Earth has been visited by extraterrestrials, extraterrestrial life is theoretically plausible.