The correct answer is:
B. They investigated railroad practices to determine if rates were reasonable and just
Step-by-step explanation:
The Interstate Commerce Commission was created as a federal regulatory agency of commercial transactions or transportation between states in 1887. The Interstate Commerce Commission had as main purpose to regulate the railroad industry, and they investigated railroad practices to determine if rates were reasonable and just for the consumers, they required that railroad rates had to be public and prohibited price discrimination toward small markets.