Answer:
Option (a).
Step-by-step explanation:
The primates shows well developed social behavior and easily distinguishable on the basis of social groups. The social organization in primates help them to show dominant behavior in society and helps them to protect from their enemies.
The dominance character of the primates makes them superior in their social groups. Communication among primates helps them to develop the social behavior. The cohesion is the proximity and bond strength among the individuals. The dominace and communication plays important role in the cohesion of pimates.
Thus, the correct answer is option (a).