23. The following information pertains to Long Inc.'s investment in marketable debt securities: A marketable available-for-sale debt security costing $40,000, written down to $25,000 in Year 4, had a $30,000 fair value on December 31, Year 5. On December 31, Year 5, Long reclassified a debt security with a $100,000 carrying cost and a $90,000 fair value from the trading category to the available-for-sale category. All changes in the value of the available-for-sale securities are noncredit related and considered temporary. What is the net effect of the above items on Long's available-for-sale debt securities valuation allowance for unrealized losses as of December 31, Year 5? A. No effect. B. $5,000 decrease. C. $10,000 decrease. D. $15,000 decrease