Question ID:PT37 S4 Q18 Passage:A plausible explanation of the disappearance of the dinosaurs is what is known as the comet theory. A large enough comet colliding with Earth could have caused a cloud of dust that enshrouded the planet and cooled the climate long enough to result in the dinosaurs' demise. Stem:Which one of the following statements, if true, most seriously weakens the argument? Correct Answer Choice:BChoice A:One of the various schools of paleontology adheres to an explanation for the disappearance of the dinosaurs that is significantly different from the comet theory. Choice B:Various species of animals from the same era as the dinosaurs and similar to them in physiology and habitat did not become extinct when the dinosaurs did. Choice C:It cannot be determined from a study of dinosaur skeletons whether the animals died from the effects of a dust cloud. Choice D:Many other animal species from the era of the dinosaurs did not become extinct at the same time the dinosaurs did. Choice E:The consequences for vegetation and animals of a comet colliding with Earth are not fully understood.