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 possibilities frontier, which of the following describes possible combinations of output?

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)