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Opportunity cost is the value of the next best alternative forgone when a choice is made. Here the two key options are: (1) work overtime and earn extra pay, or (2) attend the concert and gain enjoyment/experience. Choosing overtime means giving up the benefit of attending the concert; therefore, the opportunity cost is the enjoyment/value associated with the concert (C). This aligns with HiSET economics objectives that emphasize trade-offs and rational decision-making. Option A confuses cost with benefit—the wages are what the worker gains, not what is sacrificed. Option B is a component of the chosen activity but not the benefit of the rejected alternative. Option D is a minor monetary expense within the chosen option; it does not capture the primary value sacrificed. Understanding opportunity cost helps interpret consumer choices, business decisions, and public policy trade-offs by making the implicit “price” of foregone alternatives explicit. Thus, C is correct.