I think the answer should be d
There were more roads being built. For example, The National Road.
Second, steamboats came into existence. They allowed travel against the stream of rivers.
The Erie Canal was completed at this time as well. It connected the Great Lakes (and thereby the Mississippi) to the East Coast.
Solon's contribution to the city-state of Athens was to D. establishment of courts with juries. (Think of democracy.)
Answer:
... be less afraid of the dark?!?! I am confused with this question.
Explanation: