Answer: C. The current market value of the land
Explanation:
The previous costs incurred should be considered irrelevant because they are sunk costs. They have already been incurred and according to the principle of Relevant Cost in Accounting, such information should not be taken into account when analysing a project as it could lead to management making the wrong decision due to information clutter.
What matters now is the current market value of the lot and that is what should be included in the analysis of the expansion project for the cost of the land.