Consider the Production Possibilities Frontier (PPF)shown in the Figure Below

Multiple Choice

Consider the production possibilities frontier (PPF) shown in the figure below to answer the following questions. use the figure above to answer the following questions :

-The set of efficient points is best described as

A) only area O: points outside the PPF.
B) points on the PPF only.
C) only area I: points inside the PPF.
D) area I: inside the PPF and points on the PPF.
E) area O: outside the PPF and points on the PPF.