5. Based on the marginal decision rule, Eric should * 1 point 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. (O c) consume 20 pizzas a month, because at this point net benefits are zero. O d) consume 10 pizzas a month, because his marginal benefit of pizza is decreasing. O e) None of the above