Traveling to and from cities became easier. (I think thats correct)
The correct answer should be reward. In order to reward buyers for buying, you put the prices lower even though in reality you could be making the same mount of money. You thus decide to earn less money but you reward your buyers for being loyal or you get them to buy.
US is more rude to Native Americans. While US is more kind to in foreign affairs because they want to get stuff out of the trade.
Yes it is absolutely true that the Comitatus was a bond between a king and his nobles (called Thegns). The correct option among the two options that are given in the question is the first option or option "a". The word comitatus actually comes from the word committee and it means gathering together and discussing as well as instructing the subordinates.
