scarcity is illustrated by the area inside the frontier containing point $R$; choice is illustrated by point $S$; opportunity cost is illustrated by the distance between point $R$ and point $P$.

scarcity is illustrated by point $S$, which represents an unattainable output level with current resources; choice is illustrated by the necessity of selecting a single point on the frontier, such as $P$ or $Q$; opportunity cost is illustrated by a movement from $P$ to $Q$, where producing more capital goods requires sacrificing some consumer goods.

scarcity is illustrated by point $P$, where all resources are fully and efficiently employed; choice is illustrated by the movement from point $R$ to point $P$; opportunity cost is illustrated by point $S$, which represents the foregone benefits of economic growth.

scarcity is illustrated by point $R$, which indicates a shortage of consumer goods relative to capital goods; choice is illustrated by the movement from point $P$ to point $S$; opportunity cost is illustrated by the straight-line distance between $P$ and $Q$.