Opportunity Cost as Forgone Alternative

Steps:

• Recall that opportunity cost measures the value of choices in economics.
• Evaluate each option against the standard definition of forgoing the next best option.
• Eliminate choices describing scarcity, allocation, or direct costs.
• Select the option matching the core idea of alternatives in decision-making.

Why D is correct:

• Opportunity cost is defined as the value of the next best alternative forgone, per economic principles like those in Lionel Robbins' scarcity framework.

Why the others are wrong:

• A describes resource allocation, a broader economic process, not cost.
• B refers to direct consumption costs, like price, not alternatives.
• C defines scarcity, the root of economic problems, not decision costs.

Final answer: D