The Sherman Antitrust Act was made to break up the trusts that were made in the government. For example, if I vote for a candidate that got into the presidential elections, and wins, I will get a job in the government, that's a trust. Your answer would likely be B!
The reason why is because corporations could vote for a candidate and in return get something in the government. That would go in their interests and they could control the government.
Have a nice day! :)