Which of the following does NOT have an opportunity cost?

Sunlight

The correct answer is Option (3) → Sunlight

Sunlight does not have an opportunity cost. Opportunity cost refers to the value of the next best alternative that is foregone when a decision is made. While soap, software, and stylus all involve choices and trade-offs, sunlight is a natural resource that typically does not involve decision-making in the same way as the other items listed.