Which of These Statements About Inventory Management Is BEST

Which of these statements about inventory management is BEST?

A) Spot stock warehouses need less inventory to meet the needs of customers.
B) A system using air transportation experiences higher costs due to higher levels of inventory.
C) Cross-docking facilities don't need to match incoming and outgoing demand since they typically retain much of their inventory for a week or longer.
D) A system using water and rail transportation tends to have higher levels of inventory.