-The Figure Above Shows the Production Possibilities Frontier for a Country.The

-The figure above shows the production possibilities frontier for a country.The opportunity cost of a litre of milk between combination points A and B is

A) 3 litres of ice cream for a litre of milk.
B) 1/3 of a litre of ice cream for a litre of milk.
C) 4 litres of ice cream for a litre of milk.
D) 1 litre of ice cream for a litre of milk.
E) zero because at point A zero milk is being produced.