Factories A and B are each equipped with identical manufacturing equipment and produce a similar number of items each week. However, the quality assurance team in factory A consistently finds far fewer defects in its factory's products than does the team in factory B. Therefore, follows that the staff at factory B must be underperforming.
Which of the following, if true, would most weaken the conclusion above?
【选项】
Factory B reported more defects two years ago than it did last year or three years ago.
选项是否正确？