The correct answer is B) The United States became the world leader in steel production.
According to the table, the state of the steel industry in the United States at the turn of the 20th century was that the United States became the world leader in steel production.
Let's remember that the foundation of the strong steel industry in the United States was established by the Steel company founded by wealthy businessman Andrew Carnegie, who centered the production of steel in Pittsburg, Pennsylvania. Although it was criticized for being a monopoly, his company set the foundation of a great steel industry that at the turn of the 20th century made the US a world leader in the production of quality steel that is exported.