What do economists mean when they speak of price as a rationing mechanism?

Question 37Select one:

a.That all goods produced will be sold.

b.Consumers get the products they want at prices they can afford.

c.That shortages of goods in the market price will disappear as a result of price rising which results in the quantity demanded increasing and the quantity supplied decreasing.

d.That shortages of goods in the market price will disappear as a result of price rising which results in the quantity demanded decreasing and the quantity supplied increasing.