Of these four, who do you think was the worst Robber Baron? Why?

⟹ Included in the list of so-called robber barons are Henry Ford, Andrew Carnegie, Cornelius Vanderbilt, and John D. Rockefeller. Robber barons were accused of being monopolists who earned profits by intentionally restricting the production of goods and then raising prices.

⟹ John D. Rockefeller controlled much of the American oil industry during the late 19th century and his business tactics made him one of the most notorious of the robber barons.

explanation: d

a.   it resulted in widespread unemployment.