A. This is a current variable cost that will continue in the future unless it is changed. Sunk costs are past costs that have already been incurred and cannot be changed.
B. This is an historical cost that has already been incurred and cannot be changed in the future. That is the description of a sunk cost.
C. This is a current cost that will be continue in the future unless it is changed. Sunk costs are past costs that have already been incurred and cannot be changed.
D. This is a current cost that will continue in the future unless it is changed. Sunk costs are past costs that have already been incurred and cannot be changed.
