What Was Created by the Mid-1700s That Helped Connect the Atlantic

What was created by the mid-1700s that helped connect the Atlantic seaboard colonies of Great Britain to each other in a more cohesive manner?

A) an intercolonial postal system
B) an intercolonial paved roads system that connected all of the cities of the Atlantic seaboard colonies.
C) an intercolonial canals system
D) an intercolonial currency and monetary system
E) None of these are correct.