22. What does the study suggest about dolphins' communication during social play? (A) Dolphins, just like humans, use whistles, clicks, and facial expressions to communicate during social interactions. (B) The researchers observed that open-mouth play face was employed more frequently, but unintentionally when dolphins were within each other’s visual field. (C) Dolphins are able to communicate during social play using both vocalizations and visual signals, thanks to their multimodal intelligence. (D) Dolphins use a specific open-mouth facial expression to signal playful intent and prevent misunderstandings during social play with one another.