For Plato users the answer is A. "to make them less expensive to build."
I hope this helped!(:
The Great Commoner--for his ability to connect to the common man.
William Jennings Bryan had an ability to speak but also connect to the ordinary American person. He connected to the rural communities and eventually became the leader of the Populist Party and the Democratic Party. He believed in fundamental Christianity, temperance, farming, the common people.
The Silk Road was the easiest way for people to trade supplies but over the years people started to taxes everything in the silk road to the point no one wanted to do any trading there