If the country whose production possibilities curve is on the curve at the bottom and wishes to move to a position further up on the curve, it will:
a. Find this impossible to achieve given the resources it currently possesses.
b. Have to employ all currently unemployed resources to accomplish this
c. Incur an opportunity cost of having to give up some butter in order to make additional amount of guns desired
d. Be able to make the desired switch only if there is a significant improvement in the technological base available to the nation