Please answer with reason for all why the option is correct and why the other options are incorrect

Please do not touch this question if you are going to provide useless explanation

I will rate the answer

You are designing the testing approach over the sources of taxable income included in management's analysis of the realizability of deferred tax assets. Which statement is TRUE when testing management's analysis?

A. Future reversal of existing taxable temporary differences is a subjective source of taxable income and thus, requires significant involvement of the core engagement team

B. We do not need to refer back to prior year workpapers when testing taxable income in prior carryback years

C. When testing projections of future taxable income, we should assess whether the forecasts are consistent with those used in the client's fixed asset impairment analysis

D. Tax planning strategies are the most objective source of taxable income and should be considered first when assessing the realizability of deferred tax assets