5. Based on the marginal decision rule, Eric should * 111 a) consume 20 pizzas a month, because this is the quantity Where marginal cost is equals marginal benefit. b) consume 40 pizzas a month, because this maximizes his total benefit. c) consume 20 pizzas a month, because at this point net benefits are zero. d) consume 10 pizzas a month, because his marginal benefit of pizza is decreasing. e) None of the above