The correct answer is D) Setting prices for key war materials such as steel, iron, and rubber.
The War Industries Board was a federal agency created to ensure that the US military had the proper equipment needed in order to be successful in the war. The War Industries Board had the power to tell companies how much of a product to make and could also influence the price. This amount of government influence in the economy was extremely rare, as usually the American government let competition and business owners decide the amount of production and the prices of their goods.