The social structure of a given primate species is influenced by which of the following?
a. the types of predators inhabiting the environment
b. distribution of food resources
c. relationships with other primates species in the area
d. all of these

The correct answer is option d, that is, all of these.

Explanation:

The social composition of the primate species relies upon the kind of predators, their associations with other species in the region and the dispersion of food resources. The habitat where the pressure of predators is huge and the size of the primate body is small, there the primates group in huge numbers to prevent the predation.  

Identically, where the food is present in abundance, the grouping of primates takes place in huge concentrations, on the other hand, when the distribution of food is dispersed, the primate produces a small group of only two-three or does feeding alone.  

Also, the association of primates with other species also does an essential function in finding their social composition. On certain occasions, these primates generate groups with other species in order to prevent the predation. Also, they can share the habitats with other species in order to exploit the distinct resources.