From June through August 1987, Premiere Airlines had the best on-time service of 10 United States airlines. From January through March 1988, Premiere Airlines had the worst on-time service of the 10 airlines. The on-time performance ranking of the other nine airlines relative to each other remained unchanged.
>Which of the following, if true, would most contribute to an explanation of the facts above?
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AAlthough Premiere Airlines only revoked its policy of routinely holding flights for late passengers in the fall of 1987, the other nine airlines never had that policy
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BPremiere Airlines reduced its business by 10 percent when it raised its rates in the fall of 1987 to compensate for rising gasoline costs
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CPremiere Airlines bought five new planes in the fall of 1987 that proved to have fewer mechanical problems than the ones they replaced
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DPremiere Airlines serves New England, which has heavy winter snowfalls, whereas the other airlines do most of their business in warmer regions of the country
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EAlthough all 10 airlines strive to keep their flights on schedule, overcrowded airports increased flight delays for all 10 airlines in January 1988 as compared with June 1987
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正确答案: D