Willis and Dill (2007) Observed Dall's Porpoises (Phocoenoides Dalli) to Determine

Willis and Dill (2007) observed Dall's porpoises (Phocoenoides dalli) to determine whether or not mate guarding occurs in this species. To do so, they compared the behavior of 18 male-female pairs with that of 24 male-male interacting pairs and found that

A) male-female pairs were less likely to surface at the same time than were members of male-male pairs.
B) male-female pairs were more likely than male-male pairs to join other individuals.
C) members of male-female pairs maintained shorter distances between one another than did male-male pairs.
D) when paired with a female, males were less likely to respond aggressively to approaches by other adult males.