Assume That the Opportunity Cost for Germany to Produce a Jet

Assume that the opportunity cost for Germany to produce a jet is 50 cars.If Germany is producing on its production Possibility Frontier,some possible combinations of output for Germany could be:

A) (1,000 jets, 5,000 cars) and (900 jets, 10,000 cars) .
B) (1,000 jets, 5,000 cars) and (900 jets, 15,000 cars) .
C) (2,500 jets, 2,000 cars) and (2,300 jets, 20,000 cars) .
D) (2,500 jets, 2,000 cars) and (2,300 jets, 3,000 cars) .