Constantine was the last Roman emperor who was able to unite the Roman Empire. He moved the capital to Constantinople in the fourth century, which was located in Byzantine.
The answer is
b.24.
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Buddhism, Central Asian military techniques, and western cultural styles came to China due to the Silk Roads.
Great Britain, France, Spain, and Germany.
In all three countries, and especially from the perspective of Canada, the people of Canada, by virtue of living in a discrete geographic area far away from Britain with its own resources and own history and with people born and raised here (especially the First Nations in Canada) and who have made their life here and engaged in economic activity here has forged Canada into a separate nation. Also I believe that the threat of another revolution as occurred in the 13 Colonies to oust Britain may have allowed Canada to help loosen the colonial ties with Britain.