Answer:
D. Stereoscopic vision.
Step-by-step explanation:
Option A - Geographical locations remain one of the distinguishing features between the new world monkey and old world monkey. While old world monkeys can be traced to Africa and Asia, new world monkeys can be traced to the America - North and South America
Option B highlights on the prehensile ability of there tail. This is also found to be a remarkable difference between the two breeds. While the new breed has a prehensile defined tail, this can not be said of the old breed.
Showing of oestrus presents another distinguishing attribute between the two monkeys. Old world monkeys oestrus features closely resemble that of humans. On the other hand, new world only only post a microscopic or infinitesimal display of oestrus tendencies.
Stereoscopic vision - it is established that almost all found primates share this specific feature. Thus, new world monkeys and world monkeys are not an exception. Hence, in the light of the question, we've found this as the appropriate answer.
Both differs on the amount of special dimorphism.