What Was One of the Downsides of the State of the Railroad

What was one of the downsides of the state of the railroad industry?

A) As the railroad industry was in a state of decline, companies rarely hired many employees and instead relied on intense animal labor.
B) As the railroad industry was in a state of decline, there were not enough supplies or a process in place for moving employees from one part of the country to another.
C) As the railroad industry was, for a time, experiencing a boom, successful companies tended to refuse to engage in lobbying and, thus, missed the chance to form relationships in Washington.
D) As the railroad industry was experiencing a boom, companies often cared more about money than preventing dangerous work conditions for their laborers.
E) As the railroad industry was experiencing a boom, not nearly enough railroads were built to meet the public demand, and other competing transportation technologies sprang up in the meantime.