That fact that the United States allows a certain amount of foreign cheese into the country each year would be an example of an "import quota," since it is setting a limit on the import of a specific product.
D) The passage of the amendments was to abolish slavery and establish rights to previous slaves.
The WPB or War Production Board set the products that would be needed for war and they determined their pricing.
So I agree with you, the answer is A.
But I must admit I was a bit iffy between A and D but I'd still say that A is a better choice.
Hope this helped
