The passage suggests which of the following about captive cetaceans? A. Whether they are engaged in social learning is a subject of disagreement among biologists. B. Their ability to imitate new behaviors is more extensive than that of non-captive cetaceans. C. They exhibit few behaviors that have not also been observed in cetaceans in their natural habitats. D. They appear to adopt new behaviors more quickly than non-captive cetaceans. E. They exhibit tendencies that suggest a capacity for the kind of behavior that qualifies as cultural.