The post classical era marked expansion of civilizations and development of trade. International trade developed even beyond Silk Road expanding to Europe, Africa, Asia.
Islam started spreading based on the revelation of prophet Muhammad in the Arabian Peninsula. Islam had a reflection of Jews, Christians and Zoroastrians.
Islam started spreading widely in Africa, Europe and Asia due to invasions, expansions, merchants and trade activities.
Africa was the first continent to be converted to Islam. Almost one third of the Muslims are in this continent.
I believe the answer is A because Europeans often overlooked the native americans, which is also why they overlooked their literary traditions because their language was overlooked.
