Figure 113 Shows Mendork's Production Possibility Curve for the Only Two

Multiple Choice

Figure 1.13 shows Mendork's production possibility curve for the only two goods that it produces-guns and butter.

-Refer to Figure 1.13 to answer this question.If Mendork's production is currently that indicated by point a,what is the cost of producing four more guns?

A) 1 tonne of butter.
B) 2 tonnes of butter.
C) 6 tonnes of butter.
D) 10 tonnes of butter.