问问这题目---是GWD的？请指教

GWD31-40

A shortage of orders for Manto Aircraft’s airliners has led analysts to predict that ]

the manufacturer will have to lay workers ,the new order that consolidated

airlines has just made for 20 of Manto’s model TX jets does not provide a reason

for the analysts to revise their predictions ,because simultaneously with its new

order , consolidated canceled its existing order for an equal number of manto’s

larger, more expensive model Z uets

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

1)      Manto relies more heavily on outside subcontractors to provide the labor to

manufacture the Model Z than it does the Model TX

2)      The Manto employees who currently work to manufacture the model Z are

Not proficient at manufacturing the model TX

3)      Manto includes all required maintenance work for the first five years in the

price of each jet it sells .

4)      Manto has had to lay off workers several times within the past ten years but

has typically rehired many of the workers when it subsequently received new orders

5)      A large number of the airliners in consolidated is fleet are at the beginning of

their expected service life.

搜索过，没这题目的？

请问这题目什么意思啊？看不明白。凭感觉选了个A

My choice is A too. The argument assumes that the change in the composition of the order jet models have no impact on the use of the labors/workers of the specific manufacture -Manto. But A introduces a situation where the assumption does not hold -the new model needs more work by the workers of Manto than does the old model.