Which of the following statements is correct?A 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.B 8. The own price elasticity of demand is constant at all points along a linear demand curve.C C. As we move down a demand curve, the price elasticity becomes relatively elastic.D D. As we move up on a demand curve, the price elasticity becomes relatively elastic.E. If a firm decreases the price of its product, its total revenue must decrease.