Ian, the Owner of 5-For-1 Pizza, Has Noticed That When

Multiple Choice

Ian, the owner of 5-for-1 Pizza, has noticed that when he increases the price of his pizzas by $2.00, the number of pizzas that he sells drops by 30 percent. Ian has discovered

A) the law of supply and demand.
B) the supply curve.
C) the demand curve.
D) the law of supply.
E) the law of demand.