Answer:
b. weighted average inventory cost method
Explanation:
the weithed average, FIFO and LIFO are the three most common nventory costing methods.
Weighted average method always is in middle ground between the FIFO and LIFO result.
The company has picked neither the lowest or higher, so it picked Weighted Average.
The reason for that, is that W-A as the name implies uses all the goods and calculate a new cost per unit, doing so is influence by the first unit (FIFO) and the last units (LIFO) This makes their valuation in the middle of these other two methods results.