Choice "B" is correct. The use of resource markets outside of LQR involves opportunity cost. Opportunity costs are costs that would have been saved or the profit that would have been earned if another decision alternative had been selected. Financial accounting records do not record opportunity costs.Choice "d" is incorrect. Accounting profit is total revenue minus total explicit costs, not total explicit and implicit costs. Implicit costs are opportunity costs and are ignored in financial accounting.Choice "a" is incorrect. Implicit costs are opportunity costs.Choice "c" is incorrect. Explicit costs are not opportunity costs. Explicit costs are documented out-of-pocket costs.