the proportion of the trees cut down by the woodcutters each year that are cut in the forests used by monarch butterflies for hibernation the amount of forest land suitable for monarch butterfly hibernation that is not currently used by monarch butterflies for hibernation the amount of plant life trampled by the tourists that is not necessary to the survival of monarch butterflies the proportion of hibernating monarch butterflies that fall of the trees
Monarch butterflies spend the winter hibernating on trees in certain forests. Local environmental groups have organized tours of the forests in an effort to protect the butterflies' habitat against woodcutters. Unfortunately, the tourists trample most of the small shrubs that are necessary to the survival of any monarch butterflies that fall of the trees. Ttherefore, the tour groups themselves are endangering the monarch butterfly population.
Which one of the following would it be most useful to know in evaluating the argument?