How Was the Flow of Goods Directed Around the Globe

How was the flow of goods directed around the globe in the nineteenth century?

A) By new communication systems, such as the telegraph, that could direct ships from port to port
B) By letters sent between merchants and captains as ships waited in ports
C) By letters of transit that were given to ships' captains before leaving, which directed their routes and activities
D) By networks of carrier pigeons that carried directions for ships across the seas