Why Were Washington Duke and His Son James Buchanan Significant

Why were Washington Duke and his son James Buchanan significant figures?

A) They worked as the first sharecroppers.
B) They perfected the mass production of cigarettes.
C) They wrote about their struggles as industrial expansion slowed.
D) They developed a series of successful textile mills.
E) They popularized the business strategy of refusing to cooperate with competitors at all costs.