avohden wrote:
Advertisement in the Harptown Train Station:
The Harptown Transport Society reports that the Silver Bullet train has the fewest delays per rush-hour period
of any high-speed train. This shows that the Silver Bullet train is one of the most efficient trains currently in use.
Which of the following, if true, most seriously weakens the argument in the advertisement?
(A) The Harptown Transport Society report listed many non-high-speed trains in other metropolitan areas
that were more frequently delayed than the Silver Bullet train.
(B) In recent years more travelers have regularly ridden the Silver Bullet train than any other high-speed train.
(C) High-speed trains are more likely to be delayed during rush hour than any other type of train.
(D) The difference between the number of delays on the Silver Bullet train and that for other high-speed trains
is quite pronounced.
(E) The Harptown Transport Society updates its findings regarding train delays only once a year.
Source: GMAT Hacks - 091713
Can Narrow it down to C & E.
But C creates ambiguity as it states "High-speed trains are more likely to be delayed during rush hour than any other type of train".This tells us that even though high speed trains are delayed during rush hours,Silver bullet has the fewest delays during that time.Clearly,silver bullet is more efficient than any other train as it has fewer delays even though fast trains are delayed.
IMO E is the right choice.