Which of the following is true about the demand curve?
A) It is used to illustrate the effect of price on the quantity supplied.
B) It is always graphically depicted by a straight line.
C) It shows the quantity of product customers will buy in a market during a period of time even if other factors change.
D) It usually slopes upward and to the right.
E) It shows the relationship between product demand and product price.
Answer: E