Answer: Economic costs of production differ from accounting costs in that "a. economic costs add the opportunity costs of a firm using its own resources while".
Explanation: The opportunity cost is the cost of the alternative that we waive when we make a certain decision, including the benefits that we could have obtained from having chosen the alternative option.
In other words it is referred to as "the value of the best option not selected."
Accounting costs do not take into account opportunity costs.