Concept:Average stock is the mean value of the opening stock and the closing stock during a trading period.Explanation:The formula for average stock is:Average stock=2Opening stock+Closing stockGiven opening stock =D2,000 and closing stock =D3,000.Average stock=22,000+3,000=25,000=D2,500Turnover and purchases are not needed for this calculation.Answer:C. D2,500