If the price of a good decreases, the resulting increase in the quantity purchased decreases the marginal utility of the good

Which of the following is not a way by which price-discriminating firms can segment a market?

A) on the basis of the supplier's marginal cost of production, for example requiring customers to pay a premium for customizing options B) on basis of the buyer's location, for example requiring out-of-state students to pay higher tuition C) on the basis of time of purchase, for example long-distance calling D) by requiring an advance purchase, for example airline tickets

Refer to the figure above. This country has comparative advantage in

A) X. B) Y. C) both X and Y. D) Can't tell without more information.