Answer: D. the railroad industry, whose ability to set its own prices was now limited
Explanation:
The Interstate Commerce Act was passed after years of complaints against the Railroad industry which practiced price discrimination and other monopolistic practices that enabled them to make massive profits.
The Act limited their ability to set their own prices and required that their prices be just. This meant that they could no longer charge exorbitant prices. The Railroad industry was therefore opposed to this and lobbied against its passing.
