Answer: B. by working together voluntarily
In 1883, railroad companies were able to standardize their timetables. One of the best practice that they did is that they work together voluntarily for the welfare of the majority. It is the unity that they were able to construct that made the standardization of their timetables.
Deregulation was a process of removing federal authority and regulations from certain industries in order to help them prosper more easily. Some industries boomed and some busted, most notable being the savings and loans industry with banks having an easier time to do their business with the people. Some industries weren't affected at all like the agricultural industry, most notably farmers.
Alexander knew that if he just forced the Hellenic culture on the nations and people he conquered, there would be mass resentment, and uprisings. He blended cultures to prevent that, and really, it worked.