A Distribution of Goods Is Inefficient

A distribution of goods is inefficient

A) only when an economy is producing inside its production possibility frontier.
B) only when an economy is producing at the wrong point on the production possibility frontier.
C) either when an economy is producing inside the production possibility frontier or when an economy is producing at the wrong point on the production possibility frontier.
D) when the economy is producing at the optimal point on the production possibility frontier.