In order to maximize net benefits, the managerial control variable should be used up to the point where: Select one: a. average costs equal marginal benefits. Incorrect b. total costs equal total benefits. c. net marginal benefits equal zero. d. average benefits equal marginal costsWhich of the following is true under monopoly? Select one: a. P=MC b. All of choces are true under monopoly Incorrect c. P is greater than MC d. P is less than MC