Question

why did a provision of the interstate commerce act require railroads to make their rates public? so that railroads could operate more quickly and efficiently so that different railroad companies would know what to charge so that railroad employees did not have to remember the rates so that railroad companies couldnt unfairly charge different rates

Explanation:

The Interstate Commerce Act aimed to regulate railroad practices. Making rates public was to prevent unfair pricing (like charging different rates unjustly) by increasing transparency. The other options are illogical: rate publicity doesn’t directly improve operational speed, railroad companies already know their charges, and employees remembering rates isn’t the purpose of publicizing rates.

Answer:

so that railroad companies couldn't unfairly charge different rates