Question

a provision of the interstate commerce act was that railroads had to make their rates public. this was important so that
railroad employees didnt have to remember the rates
railroads couldnt unfairly charge different rates.
railroads could operate more quickly and efficiently.
different railroad companies would know what to charge.

Explanation:

The Interstate Commerce Act aimed to regulate railroad practices. Making rates public was to prevent unfair rate discrimination (like charging different rates unjustly to different shippers/customers). The other options are illogical: remembering rates wasn't the goal, public rates don't directly make operations quicker, and companies set their own rates (publicity was for fairness, not dictating charges).

Answer:

B. railroads couldn't unfairly charge different rates.