the public's widespread belief in the existence of UFOs and their general curiosity about extraterrestrial life has generated considerable interest in science fiction.
a) UFOs and their general curiosity about extraterrestrial life has
b) UFOs and they are generally curious about extraterrestrial life which has
c) UFOs, as well as their general curiosity about extraterrestrial life, have
d) UFOs, as well as its general curiosity about extraterrestrial life, has
e) UFOs, as well as general curiosity about extraterrestrial life, have