Answer:
Trade became more difficult, as well as the movement of armies. It is hard to protect a falling Roman Empire from enemies when the roads don't support moving armies. Trade took a hit because how are you supposed to transport items from one way to another for sale if the roads cannot support your caravans?
The answer is An EXECUTIVE ORDER.
hope this helps
The central government didn't have the power to tax the states
I think it goes like this
1) b
2) c