A polyandrous bond is primarily found among:​

A) ​the apes because pair bonding helps with rearing offspring during a long adolescence
B) ​all monkeys because of territorial issues and the need to protect young
C) ​some New World monkey species in which males assist with offspring
D) ​some Old World monkey species in which females assist each other with offspring

Polyandrous bonds, in which one female mates with multiple males, are primarily found in some New World Monkey species such as marmosets and tamarins. In these species, males (including the father) assist with the rearing of young, making the sharing of a female partner advantageous for all males involved. This type of group living and cooperation among males is thought to have evolved as a result of limited resources and increased challenges in raising offspring alone. Other primates, such as Old World monkeys and apes, tend to form pair bonds or harem groups with one male and multiple females.