Which one of the following statements is incorrect? A. It is possible to make inter-personal comparisons of utility, that is, it is possible to compare the utility derived by two different consumers from the consumption of the same product (eg beef). B. A consumer is in equilibrium when his or her total utility is at a maximum C. Total utility is the sum of all the marginal utilities. D. Weighted marginal utility is the marginal utility per unit divided by the price of the product in question. E. Utility is the degree of satisfaction that a consumer derives (or expects to derive) from the consumption (use) of a product or service (eg carrots).