What is an example of “trust-busting” that theodore roosevelt enforced?

"He supported the Northern Securities Company" is an example of “trust-busting” among the choices given in the question that Theodore Roosevelt enforced. 

Just think, why was it effective? -it appeled to critics because it was written well, that made it noticeable to the public including the white population-it was also recognizable to the african americans because it was about their heritage.-it was powerful just keep finding more points and elaborate on them. message me if you need more

The answer is a price setter because they are the ones they add on the price.