Answer: b. have specialized digestive anatomy for eating leaves.
Step-by-step explanation:
The colobine primates have stomach compliments that are divided into saccus gastricus, tubus gastricus and parpylorica. Saccus gastricus could be with or without presaccus and it is the place where fermentation occurs through bacteria, while tubus gastricus and parpylaria is the site where enzymatic digestion starts from.
Colobine primate feeds on leaves and they have multi chambered stomach company which helps in the digestion of hard leaves, this means colobine primate can be regarded as ruminant primates.