The correct answer is A. Technological advances such as s<em>team power, air brakes, automatica lubricators and steel tracks</em> have affected the railroads very positively, since it has made it possible that the rail network could become a safer, more efficient and more reliable means of transportation for goods.
B) The federal government must change its law.
don't know but good luck on getting an answer have a good day
E. winning battles at trenton and princeton
