The correct answer is Option b) The purchase enabled Carnegie to discover a more efficient production method.
Andrew Carnegie was a steel magnate of Scottish origin who was at the time, one of the richest people in the United States.
By today's time, he would have been worth more than $300 billion. While building his steel empire he was looking to expand vertically and buy smaller companies in order to eradicate competition.
With the purchase of Allegheny Steel , he was able to develop a more efficient production method.