The sentence "[T]he Europeans did not invent globalization" is best placed at option 3. Here's why:
The paragraph describes the early stages of globalization, focusing on trade and commerce around the year 1000, especially between China and Southeast Asia. It contrasts this period with the developments after 1492.
This sentence should logically link the existing global interactions to the European role after 1492. Placing it at option 3 smoothly conveys that while Europeans significantly changed global trade after 1492, they did not initiate globalization.
This makes the paragraph flow better, recognizing the long history of global exchange and countering the idea that Europeans were the first to globalize.