Which of the Following Statements Applies to Pellis and Iwaniuk's

Which of the following statements applies to Pellis and Iwaniuk's study of play in muriod rodents?

A) Species-specific play fighting complexity scores mapped well onto the muriod rodent phylogeny.
B) Play fighting repertoires could not have evolved independently in different species of muriod rodents over time.
C) Ancestral muriod rodents likely engaged in very simple forms of play.
D) Play behavior can only become less complex over evolutionary time.
E) Male-female association patterns did not correlate well with play complexity.