40. GWD31-40

A shortage of orders for Manto Aircraft’s airliners has led analysts topredict that the manufacturer will have to lay off workers, the new order thatconsolidated airlines has just madefor 20 of Manto’s model TX jets does not provide a reason for the analysts torevise their predictions, because simultaneously with its new order, consolidated canceled its existing order foran equal number of manto’slarger, moreexpensive model Z jets.

Which of the following, if true, most seriously weakens the argument?

A.     Manto relies more heavily on outside subcontractorsto provide the labor to manufacture the model Z than it does the model TX

B.     The Manto employees who currently work to manufacture themodel Z are not proficient at manufacturing the model TX

C.     Manto includes all required maintenance work forthe first five years in the price of each jet it sells

D.     Manto has had to lay off workers several times within thepast ten years but has typically rehired many of the workers when itsubsequently received new orders

E.      A large number of the airliners in consolidated fleet areat the beginning of their expected service life

我也觉得A不对，但不理解为什么C对，求指教，谢谢啦！