According to government official involved in overseeing airplane safety during the last year, over 75 percent of the voice-recorder tapes taken from small airplanes involved in relatively minor accidents record the whistling of the pilot during the fifteen minutes immediately preceding the accident. Even such minor accidents pose some safety risk. Therefore, if passengers hear the pilot start to whistle they should take safety precautions, whether instructed by the pilot to do so or not.
The argument is most vulnerable to criticism on the grounds that it
(A) accepts the reliability of the cited statistics on the authority of an unidentified government official
(B) ignores the fact that in nearly one quarter of these accidents following the recommendation would not have improved passenger’ safety
(C) does not indicate the criteria by which an accident is classified as “relatively minor”
(D) provides no information about the percentage of all small airplane flights during which the pilot whistles at some time during that flight
(E) fails to specify the percentage of all small airplane flights that involve relatively minor accidents
The argument is most vulnerable to criticism on the grounds that it
(A) accepts the reliability of the cited statistics on the authority of an unidentified government official
(B) ignores the fact that in nearly one quarter of these accidents following the recommendation would not have improved passenger’ safety
(C) does not indicate the criteria by which an accident is classified as “relatively minor”
(D) provides no information about the percentage of all small airplane flights during which the pilot whistles at some time during that flight
(E) fails to specify the percentage of all small airplane flights that involve relatively minor accidents
But if you have any question, probably I can answer tomorrow when I will be fresh 
