Final answer:
Traders during historical periods of significant trade development primarily came from Europe, Africa, and Asia, collectively known as Eurasia. The correct options are a and b.
Step-by-step explanation:
Regions Involved in Historical Trade Periods: The question seems to be asking about the regions from which traders came during significant historical periods of trade development. Without a specific time frame, we can provide a general answer that applies to several important historical epochs. For much of documented history, particularly between 1400 and 1700 A.D., traders primarily came from the continents of Europe, Africa, and Asia. An example of this is the Trans-Atlantic slave trade, where the region of West Africa was most directly involved, as well as trade on the Swahili coast, where most of the enslaved people traded came from the interior of the African continent.
During the expansion from a regional to an interregional world, the major empires and trading networks were primarily located within Eurasia. This refers to the connected continents of Africa, Europe, and Asia, which through over 2,000 years of interaction, gained significant economic and political advantages leading to early globalization in the 15th century.
The correct options are a and b.