Statement – II : Costs in the form of depreciation allowances and unpaid interest on the owner's own funds are known as sunk costs.
Statement I correctly defines opportunity costs. These are costs that represent the value of the next best alternative foregone. They often do not involve direct cash outlays and might not be explicitly recorded in the accounting system, as they represent potential benefits missed rather than actual expenditures.
Statement II incorrectly identifies depreciation allowances and unpaid interest on the owner's own funds as sunk costs.
Therefore, Statement II is incorrect as it mischaracterizes these cost types.
Based on the analysis, Statement I is correct, and Statement II is incorrect.