The correct answer for the first question is option D. The railroads used every legal means to avoid regulation.
The interstate commerce comission had many problems trying to regulate railroad rates because there was resistance from the railroads. They had to go through long legal processes.
The correct answer for the second question is option B. The purpose of the Sherman Antitrust Act was to eliminate any agreement or contract that restrained trade.
It was intended to protect and dissolve monopolies as well as to prevent the creation of future monopolies, because they limited competition. That's why the idea was to support competition and make monopolies and trusts illegal.