Answer and Explanation:
A will report the gain at the time when the bond is adjusted to the fair value as there is a reduction in the far value of the liabilities that occured the gain. In the case when the fair value is changed so there is also the changed in the rate of interest due to this the rate of interest is rised.
Here A would be reported the gain in the net income as there is the change in the rate of interest due to the change in the fair value
In the case when there is the chaneg in the fair value of the bond so this is because of the change in the credit risk and the same should be shown in the statement of the comprehensive income as other comphrensive income