Which of the Following Statements Is INCORRECT

Multiple Choice

Which of the following statements is INCORRECT?

A) If a firm decreases the price of its product, its total revenue must decrease.
B) The own price elasticity of demand is constant at all points along a linear demand curve.
C) As the price of X falls and we move down an individual's demand curve for X, the money income of the individual also changes.
D) None of the statements is correct.