Answer: The correct answer is "C. to draw resources necessary to make steel away from the rest of the economy, slowing the economy as a whole".
Explanation: If the United States were to produce all of its own steel, rather than importing large quantities of steel from other nations, the effect would be: to draw resources necessary to make steel away from the rest of the economy, slowing the economy as a whole.
The result would be the opposite of the one sought, since the United States seeking to produce all its steel so as not to import large quantities, would slow down the economy, this means that the economy would become flat, or in decline in which companies and consumers tend to make less decisions of purchase.