各位请教下OG的一道逻辑题目

86.Journalist: In physics journals, the number of articles reporting the results of experiments involving particle accelerateors was lower last year than it had been in previous years. Several of the particle accelerators at major research institutions were out of service the year before last for repairs, so it is likely that the low number of articles was due to the decline in availablitiy of particle accelerators.

答案是E. Recent changes in the editorial policies of several physics journals have decreased the likehood that articles concerning particle-accelerator research will be accepted for publication.这个是他因，我也想明白了。

只是我选择D，不知道错在哪里，有点想不明白。

D. Particle accelerators can be used for more than one group of experiment in any given year.这样不就否定了particle accelerators 不够的原因了么？

D is irrelevant choice.  it does not give numerical compare among 3 years.

in any given year, Particle accelerators can be used for more than one group.

how many groups used accelerators last year, previous year ?