That he wasnt right for the job
Beginning in the eighth century B.C., Ancient Rome grew from a small town on central Italy's Tiber River into an empire that at its peak encompassed most of continental Europe, Britain, much of western Asia, northern Africa and the Mediterranean islands.
I would conclude the answer is B relied on manufacturing because during the late 1700s Britain and the newly formed United States underwent a major social and economic change from agriculture to industry. The Industrial Revolution saw the introduction of the steam engine, cotton gin, and other machines capable of increasing production while decreasing human labor.