Answer:
d. add depreciation expense.
Explanation:
The first step is adding back non cash expense like depreciation, after that all non cash incomes shall be deducted as unrealized gain from change in foreign currency rates, after that there is treatment of gains and losses from investing activities.
Gains from investing activities are deducted, and losses from investing activities are added back, but it is a later step,
First step is of depreciation.