If You Wanted to Study Pair-Bonding Among Bonobos as a Window

If you wanted to study pair-bonding among bonobos as a window into understanding the evolution of human pair-bonding, you might encounter some difficulty because

A) bonobos can't talk openly about their relationships and mating habits
B) it is fairly straightforward to secure both permission and funding to study ape mating and pair-bonding
C) the wide range of marriage and kinship patterns among humans undermines any easy comparisons between the species
D) most institutional review boards prohibit the study of ape sexuality and behavior