Answer:
The correct option is D,
Unrealized Holding Loss-Trading $5,800
Fair Value Adjustment–Trading $5,800
Explanation:
The decrease in fair value by $5,800 means that the investment has potentially lost $5,800 in value which is credited to fair value adjustment while the debit is posted to unrealized holding loss-trading account.
The loss cannot be realized in retained earnings since the loss is yet to be realized as the investment has not been sold for cash.
The realized loss or gain would be determined when investment is sold for cash.