The correct answer is: A. last in first out (LIFO)
LIFO is a method of inventory accounting in which the cost of goods sold is based on the assumption that the items most recently purchased are the first ones sold. This means that the cost of goods sold will be lower in periods of rising prices, as the cost of the most recent purchases will be used to calculate the cost of goods sold.
FIFO is a method of inventory accounting in which the cost of goods sold is based on the assumption that the items first purchased are the first ones sold. This means that the cost of goods sold will be higher in periods of rising prices, as the cost of the oldest purchases will be used to calculate the cost of goods sold.
The other two options are not methods of inventory accounting.