To be horrific, a monster must be threatening. Whether or not it presents psychological, moral or social dangers, or triggers enduring infantile fears, if a monster is physically dangerous then it is threatening. In fact, even a physically benign monster is horrific if it inspires revulsion. Which one of the following logically follows from the statements above? ['Any horror-story monster that is threatening is also horrific.', 'If a monster triggers infantile fears but is not physically dangerous, then it is not horrific.', 'All monsters that are not physically dangerous, but that are psychologically dangerous and inspire revulsion, are threatening.', 'If a monster is both horrific and psychologically threatening, then it does not inspire revulsion.']