Explanation:

- Option 1: Sold

- Selling an additional unit doesn't impact the production cost directly. It is more about revenue generation.

- Option 2: Produced

- Marginal Cost refers to the additional cost incurred when producing one more unit of a product.

- It helps in decision-making regarding production levels.

- Option 3: Employed

- Hiring an additional employee doesn't directly refer to the production of goods. It relates to labor costs and workforce management.

- Option 4: Consumed

- Consumption is related to the usage of goods or services, not the cost of creating them.