The Byzantine Empire became a regional center of trade because:

b: it  controlled the city of constantinople

The answer is B: it controlled the city of Constantinople.

Explanation:

Constantinople lays on the Bosporous straight which separates Europe and Asia. The Bosporous straight also linked the Mediterranean Sea and the Black Sea-important for trade. This allowed the city to control all trade routes between Europe and Asia. So controlling Constantinople meant you controlled trade.

to regulate production on things such as fuel and production

president thomas jefferson hoped that the embargo act of 1807 would the united states by demonstrating to britain and france their dependence on american goods, convincing them to respect american neutrality and stop impressing american seamen. instead, the act had a devastating effect on american trade.