Question

through what industry did john d. rockefeller make his fortune? select an answer a. manufacturing steel b. oil refining c. the production and distribution of electricity d. railroading

Explanation:

John D. Rockefeller was a key figure in the oil industry. He founded Standard Oil and made his fortune through oil refining and the oil business. Option A is associated with Andrew Carnegie (steel), Option C with Thomas Edison and others in electricity, and Option D with railroad barons. So the correct answer is B.

Answer:

B. oil refining