Answer:
The ending inventory by using the gross method in order to record purchases amounts to $313,680. Hence, the correct option is A
Step-by-step explanation:
Net Purchases = Gross Purchases - Purchase returns - Purchase discount
 = $600,000 - $4,500 - [($600,000 - $4,500) × 4%]
 = $595,500 - $23,820
 = $571,680
Purchases = Net Purchases + Freight inward
 = $571,680 + $9,000
 = $580,680
The ending inventory will be computed as:
COGS (Cost of goods sold) = Beginning inventory + Purchases - Ending inventory
 $370,000 = $103,000 + $580,680 - Ending inventory
Ending inventory = $683,680 - $370,000
  = $313,680