When Observing Primates at the Zoo, You Notice a Male

Multiple Choice

When observing primates at the zoo, you notice a male and female gibbon quite similar in size, unlike what you previously saw in the hamadryas baboon enclosure.You know that

A) the lack of sexual dimorphism you see is due to the polygamous social structure observed in gibbons.
B) the lack of sexual dimorphism is the result of unequal access to resources within their environment.
C) the lack of sexual dimorphism you see is due to decreased competition for mates in a monogamous social structure.
D) the lack of sexual dimorphism in gibbons is not related to social structure.