23. On a certain day, nine scheduled flights on Swift Airlines were canceled. Ordinarily, a cancellation is due to mechanical problems with the airplane scheduled for a certain flight. However, since it is unlikely that Swift would have the mechanical problems with more than one or two scheduled flights on a single day, some of the nine cancellations were probably due to something else.
The argument depends on which one of the following assumptions?
A. More than one or two airplanes were scheduled for the nine canceled flights.
B. Swift Airlines has fewer mechanical problems than do other airlines of the same size.
C. Each of the canceled flights would have been longer than the average flight on Swift Airlines.
D. Swift Airlines had never before canceled more than one or two scheduled flights on a single day.
E. All of the airplanes scheduled for the canceled flights are based at the same airport.
请求这题思路！！！
题目中说 不可能有2次以上航班因为机械上原因而被取消的 所以有他因
我的理解是 他隐含了一架飞机负责一个航班，说每天不可能有一或二台以上飞机有机械故障而被取消，而这次９次航班被取消了，故他因致使航班取消
将Ａ取非，就是这九个被取消的航班是一架造成的 ，就很可能是机械故障造成的故weaken the conclusion
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