The law of supply states that as the price of a good declines, the quantity supplied of that good decreases as well.
This economic law states that other things equal, an increase in the price of a product will increase the quantity of it supplied, and conversely for a price decrease directly related.
Hence, the law of supply states that as the price of a good declines, the quantity supplied of that good decreases as well.
Therefore, the Option D is correct.
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