Which finding, if true, would most directly support Bura and colleagu…

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Veronica L. Bura, Akito Y. Kawahara, and Jayne E. Yack investigated the function of sound production in silk moth and hawk moth caterpillars. They found that during harmless simulated attacks, 33% of the tested species produced sound, which included four distinct types: chirps, whistles, vocalizations, and clicks. In addition, _Antheraea polyphemus_ and _Antheraea polyphemus oculea_ released a chemical while or after producing the first sound. These species exclusively produced clicks and chirps, which tend to be shorter in duration than whistles and vocalizations. Bura and colleagues argue that clicks and chirps in species that use chemical defenses are primarily a means of warning (i.e., "educating") predators rather than frightening or startling them.

Which finding, if true, would most directly support Bura and colleagues' claim?

Short-duration sounds like clicks and chirps tend to be especially effective in training animals to associate a behavior with a consequence.

Caterpillars that use chemical defenses produced sounds at a higher volume than did caterpillars without chemical defenses.

The acoustic characteristics of clicks and chirps make them particularly audible to bats, lizards, and birds, some of the most frequent predators of caterpillars.

Chickens and yellow warblers, two predators of caterpillars, have been observed to stop their attacks in response to caterpillar sounds of any duration.