The American businesses switched factories to wartime production, which render the effect that the U.S. companies received government contracts and prospered.
What is war?
War is basically the battle between countries or different groups or nations. Social scientist normally uses the term to such battles only if they are created and operated in harmony with socially admitted forms.
At the time when America was in the war, they switched their businesses to wartime production, as a result, the U.S. companies received government contracts and prospered.
Therefore, option D is correct.
Learn more about the war, refer to:
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