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) ​anintercolonial canals system
D) ​an intercolonial currency and monetary system
E) ​none of these choices