Which statement completes this cause-and-effect diagram?
A.
The cost of shipping goods decreases.
B.
Steamboats are invented.
C.
The National Road opens.
D.
Interchangeable parts are invented.
A.
The cost of shipping goods decreases.
B.
Steamboats are invented.
C.
The National Road opens.
D.
Interchangeable parts are invented.