According to FlightStats, the average on-time arrival rate for all U.S. airlines was 70% for the three-month period ending August this year down from 80% for the same period last year. Considering this statistic along with the fact that United Airlines was the only airline to improve its on-time arrival rate during this period from 75% last year to 80% this year, it should be logical to expect that __________________________.

If the information given in the above passage is true, which of the following must be true?

A. For the three months under consideration, the average on-time arrival rate of the all the other US airlines last year was better than the on-time arrival rate of United Airlines this year.
B. For the three months under consideration, removing the stats of United Airlines would reduce the decline in the on-time arrival rate of the US airlines
C. For the three months under consideration this year, the on-time arrival rate of United is the highest among that of all airlines.
D. For the three months under consideration, no US airline improved its on-time arrival rate even by one percentage point compared to last year.
E. For the three months under consideration, United Airlines gained at least some market share compared to last year.
_________________

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What is the OA?
Is it D? All other options seem pretty much the opposite

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My reasoning :-

for option D ,there are be chances that any US airline might have improved by more than 1%, but if many other have not improved in their time they will pull down the avg.

How is the OA A? im confused? How can one conclude that US was the only one below average and that there isnt a mix of high and low?