The Demand Curve Shows the Relationship Between

The demand curve shows the relationship between:

A) consumer income and quantity demanded, of which consumer income is the independent variable
B) price and production costs, of which price is the independent variable
C) price and quantity demanded, of which price is the independent variable on the vertical axis
D) consumer preferences and quantity demanded, of which quantity demanded is the dependent variable
E) the price of a certain product and the price of another closely related product