Answer:
A production possibilities frontier:
d. demonstrates the constraints that society faces in production.
Step-by-step explanation:
A production possibilities frontier (PPF) is a curve that shows the quantity of two goods that can be produced using the same limited resources. The PPF stipulates that resource in an economy like labor, raw materials and and capital are limited thus there is always a point in time where the quantity of goods to be produced is also limited. An value on the PPF curve represents the maximum production limit that can be achieved when the resources in the economy are utilized efficiently. A value below the curve represents inefficiency in production and represents a potential to improve a country's production capability. To move beyond the PPF curve a country has to change it's future technology.
A PPF differs from a budget constrain in one major aspect aspects. The budget constraint is a straight line meaning since it's slope is given by relative prices of two goods, while the PPF is curved due to the law of diminishing returns.