Free Goods Have Zero Opportunity Cost Steps: - Recall that a free good in economics is a resource available in such abundance that using it does not require giving up other resources. - Identify the core economic criterion: free goods incur no opportunity cost, meaning no alternative use is foregone. - Evaluate choices against this definition: A and B describe origins or costs but miss the opportunity cost focus; D addresses quantity but not cost implications. - Confirm C aligns directly, as sunlight's plentiful supply means using it doesn't sacrifice other goods or time. Why C is correct: - By definition, free goods like sunlight have zero opportunity cost because they are so abundant that consumption does not require forgoing production of other goods (per economic scarcity principle). Why the others are wrong: - A: Being a "gift of nature" describes origin, not economic classification criteria. - B: "No renewable cost" misstates economics; free goods involve no scarcity-based cost, not renewability. - D: Sunlight is abundant but not truly unlimited (e.g., night limits), and abundance alone doesn't define free goods …