關於經濟訂購量(EOQ)-英文問題 - 會計

問題:
X company has correctly computed its EOQ as 500 units however.management feels
it would rather order in quantities of 400 units.How would X's total annual
ordering costs and total annual carrying costs for an order quantity of 400
units compare to the respective amounts for an order quantity of 500 units?
(A)higher ordering cost and higher carrying cost.
(B)lower ordering cost and lower carrying cost.
(C)higher ordering cost and lower carrying cost.
(D)lower ordering cost and higher carrying cost.

答案:C 我的問題是在於英文...
我不太懂他這題問的是以400單位為基礎去比較如果變成500單位的情況
還是以500單位為基礎去比較如果變成400單位的情況
小弟不才...請高手相助~感恩!!!

--