How do the details in this passage support the central idea? The details provide examples of how France gradually became a place for worldwide trade.
The details describe the various measures that were taken to keep the merchants safe.
The details explain why Europe immediately welcomed foreign traders to its marketplaces.
The details describe how a series of wars brought about the downfall of a European fortress.

The details provide examples of how France gradually became a place for worldwide trade.

Explanation:

From the excerpt, it was written that there was a smart count in the Champagne region of France which helped in guaranteeing the safety of any merchant that came to trade at the markets.

With the passage of time, the fairs flourished and then became the one place where Europeans could buy and sell products from the surrounding world. Therefore, this showed that France gradually became a place for worldwide trade.