The production possibilities frontier illustrates

a. the combinations of output that an economy should produce.
b. the combinations of output that an economy should consume.
c. the combinations of output that an economy can produce.
d. all of the above are correct.

Option (c) is correct.

Explanation:

The production possibility frontier is a graphical representation of combination of two different goods that an economy can produce with the limited available resources. All the points on the production possibility frontier curve represents efficient allocations and all the points below that curve are inefficient.

All the points above this curve are unattainable or we can say that combination are not affordable for the economy.

answerthe united states of america;

b or d if i'm correct boi.