Diligent Ltd Had 5 Units of the Commodity Algo on Hand

Multiple Choice

Diligent Ltd had 5 units of the commodity Algo on hand at 1 September 2016.The following purchases and sales were made during September:
-What was the value of cost of goods sold of Algo,using the moving weighted average assumption and a perpetual inventory system?

A) $2640
B) $2700
C) $2720
D) $3180