Which of the following best describes the purpose of the highlighted sentence? A. It cites certain factors that Bauer and Smuts predicted would account for dogs' deviation from the 50:50 rule. B. It identifies certain expectations that Bauer and Smuts had at the beginning of their study of dogs' dyadic play. C. It explains what would occur if the subjects of Bauer and Smuts' study behaved like the subjects of the research mentioned in the previous sentence. D. It speculates about why the play behavior of dogs might resemble that of animal species previously studied. E. It challenges an assumption about the behavior of dominant dogs that had been held by many researchers.