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I hate FRA too, DTA and DTL make my head spin as is.
I’ll have a go, hope this is right:
C itself is the definition of a permanent differences between taxable income and pre-tax income. Permanent differences do not give rise to deferred taxes, thus no valuation allowances would be required.
Deferred tax assets (DTA) is created when taxable income is greater than accounting profit, and the company expects to recover the difference in the future. However, a valuation allowance is a reserve created against DTA if there is doubt on the amount of DTA that can be realized in the future. So the answer is A as we need to have valuation allowance against the DTA as the firm is unlikely to be able to take advantage of it in its future operations.