In some places, iceberg lilies are the mainstay of grizzly bears' summer diets. The bears forage meadows for the lilies, uprooting them and eating their bulbs. Although the bears annually destroy a large percentage of the lilies, scientists have determined that the bears' feeding habits actually promote the survival of iceberg lilies. Which one of the following, if true, most helps to resolve the apparent discrepancy in the statements above? ['When grizzly bears forage for iceberg lilies, they generally kill many more lilies than they eat.', 'The geographic regions in which iceberg lilies are most prevalent are those regions populated by grizzly bears.', "Iceberg lilies contain plentiful amounts of some nutrients that are necessary for grizzly bears' survival.", 'Iceberg lilies produce so many offspring that, when undisturbed, they quickly deplete the resources necessary for their own survival.']