Final answer:
The re-computation of current and future years' depreciation is required for a change from sum-of-the-years-digits to straight-line. Correct option is c.
Step-by-step explanation:
The disclosure required for a change from sum-of-the-years-digits to straight-line is the re-computation of current and future years' depreciation.
When changing the depreciation method from sum-of-the-years-digits to straight-line, it is necessary to recalculate the depreciation expense for the current and future years using the new method. This is because the sum-of-the-years-digits method front-loads the depreciation expense, while the straight-line method spreads it evenly over the useful life of the asset.
Therefore, option c is the correct answer, as it states that the re-computation of current and future years' depreciation is required.