Question ID:PT86 S1 Q1 Passage:Researcher: During the rainy season, bonobos (an ape species closely related to chimpanzees) frequently swallow whole the rough-surfaced leaves of the shrub Manniophyton fulvum. These leaves are likely ingested because of their medicinal properties, since ingestion of these leaves facilitates the elimination of gastrointestinal worms. Stem:Which one of the following, if true, most strengthens the researcher's argument? Correct Answer Choice:EChoice A:Bonobos rarely swallow whole leaves of any plants other than M. fulvum. Choice B:Chimpanzees have also been observed to swallow rough-surfaced leaves whole during the rainy season. Choice C:Of the rough-leaved plants available to bonobos, M. fulvum shrubs are the most common. Choice D:The leaves of M. fulvum are easier to swallow whole when they are wet. Choice E:The rainy season is the time when bonobos are most likely to be infected with gastrointestinal worms.