Answer:
d. Use high-pressure sales technique to sell more of the company's high production output.
Explanation:
In the 1920s there was a boom in the sales due to tariffs placed on goods from outside of the United States.
So there was more patronage for locally made products.
Marketing developed as a conscious strategy for businesses.
As a salesperson for a manufacturing firm in the late 1920s Ben will be accustomed to using high-pressure sales technique to sell more of the company's high production output.
This will be the most effective role for him.