A demand curve shows how changes in A) consumer demand affects income. B) prices affect the consumer demand. C) prices affect complementary goods. D) consumer demand affects substitute goods.

Answer:Option: B is the correct answer.B) prices affect the consumer demand. Step-by-step explanation:Demand Graph--In economics a demand graph is a graphical representations that represents or depicts the relationship between the prices of  commodity or services and the number of consumers.It shows how the demand of a commodity or services changes with the change in it's price during a period of a time.It shows how the quantity of consumption of a commodity decreases with the decrease in demand on increase in the price.The graph that represents this relationship is attached to the answer.