Which of the following statements is a good way to distinguish a scarcity from a shortage

a) A scarcity cannot be eliminated while a shortage can be eliminated in this case by an increase in price

b) none of the above: A scarcity and a shortage are essentially the same thing.

c) a shortage results from price controls, while a scarcity results from sellers preventing a certain quantity of the product from reaching the market

d) a shortage means that one cannot have everything 'we want at zero price; scarcity means that you cannot have everything you want at any price.