Concept:Cost of goods available for sale includes all costs incurred to make goods ready for sale before deducting closing stock.Explanation:Start with opening stock.Add purchases and carriage inwards (cost of bringing goods in).Subtract returns outwards (purchases returned to supplier).Do not include returns inwards, carriage outwards, or closing stock at this stage.Cost of goods available for sale:1,000+4,000+200−800=4,400Opening stock N1,000Purchases N4,000Add: Carriage inwards N200Less: Returns outwards (N800)Cost of goods available for sale =N4,400Answer:D. N4,400