The correct answer is B) Andrew Carnegie.
Strikebreakers, yellow dog contracts, and blacklisting would most likely be used by Andrew Carnegie.
Strikebreakers, yellow dog contracts, and blacklisting were questionable practices that wealthy businessmen did to maintain control over workers and factories. Carnegie was a rich man that created an emporium of steel in the United States. He was criticized to create a monopoly by buying all of its competitors. In those years, unions could not flourish because of the use of strikebreakers, yellow dog contracts, and blacklisting.