The correct answer is B. He built libraries which everyone could use.
Andrew Carnegie was known for his work which he led American to the expansion of steel industry. He was among the richest people.
In both the British empire and united states he was a philanthropist. His first job was a telegrapher, whereby later he invested in railroad sleeping cars, bridges, oil derricks and railroad.
He gained his wealth when he started job as a bond salesman where he raised money for enterprise in america which is in Europe.