Explanation:

- Option 1: Sold

- Marginal cost is not directly related to selling. It concerns the cost of production, not the transactions. Selling relates more to marginal revenue.

- Option 2: Produced

- Correct Answer

- Marginal cost is the addition to the total cost when one more unit of a commodity is produced. It reflects the cost change due to an increase in output.

- Option 3: Employed

- This relates to labor and employment. It refers more to marginal labor cost rather than marginal cost of production.

- Option 4: Consumed

- Consumption focuses on demand and utility. Marginal cost isn't applicable here as it deals with production, not consumption.