The view taken by the researchers concerning the monogamy of tamarins depended on a questionable assumption. Which of the following could have served as that assumption? A. The suppression of fighting between related females serves to protect their common genetic inheritance. B. Adult male tamarins contribute to the care of tamatin infants. C. The social system of tamatins requires monogamous pairing. D. Male tamatin monkeys do not display aggressive bahavior in the wild. E. The way the tamatins were kept in cages did not affect their mating behavior.