The Interstate Commerce Act banned railroad pools in 1887. Therefore, option A is the correct option.
The Interstate Commerce Act of 1887 was a federal law. The act made regulations for how the railroad industry should perform its business. It was enacted to regulate the railroad industry by requiring the railroad to be just and reasonable. The act was mainly to prohibit the practices of the railroad industry that encouraged its monopoly.
However, the act didn't authorize the government to decide the railroad rates in the name of fair and just rates. The act was enacted with the support of both the government parties and the pressure groups from the whole country.
So the Interstate Commerce Act of 1887 banned railroad pools. Therefore A is the correct option.
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