If the United States Was to Become the "Great Arsenal

If the United States was to become the "great arsenal of democracy," it had to ______________________.

A) take and maintain control over the important oil fields in the Middle East
B) successfully convert major industries from production of consumer goods to production of military materiel
C) convince corporate leaders to finance the retooling of their factories for the production of war materiel
D) solve transportation problems between the United States and Europe