Which of the Following Statements About Marginal Analysis Is True

Which of the following statements about marginal analysis is true?

A) Marginal analysis is typically a straightforward procedure to apply in real-life situations.
B) An important factor in marginal analysis is predicting demand,which is an exact science.
C) Marginal revenue is also the demand curve,so it represents the amount customers will buy at different prices.
D) Profit is maximized at the point at which marginal cost is exactly equal to marginal revenue.
E) The cost of producing a unit beyond the point when marginal cost equals marginal revenue is much less than the revenue from the sale of that unit.