TOEFL Reading: ETS-TOEFL阅读机经 - HYVJ36TILR61654WL$

According to paragraph 4, the playback experiments of Ryan and Tuttle demonstrated which of the following A. Túngara frogs use both whines and whine-chucks in their vocalizations. B. Female túngara frogs are attracted to both whine and whine-chuck vocalizations. C. Female túngara frogs and predators of túngara frogs are attracted to different types of vocalizations. D. Frog-eating bats are attracted to whine-chuck calls more than to whines alone.