If a Production Possibilities Frontier Is Bowed Outward,then the Opportunity

If a production possibilities frontier is bowed outward,then the opportunity cost of producing more of the first good is highest when

A) the economy is producing much of the first good and little of the second good.
B) the economy is producing equal amounts of the first and second goods.
C) the economy is producing little of the first good and much of the second good.
D) None of the above is correct because the opportunity cost of producing more of the first good is constant.