The supervisor of a cigar rolling unit argues: 'Among our rollers, the longer a woman has worked here the more sticks she rolls in a day. Kamala has worked here longer than any other roller. Kamala must therefore roll more sticks in a day than anyone else in the shed.' Which of the following, if true, most weakens the supervisor's argument?

The supervisor treats a tendency across the shed as though it fixed the position of one particular roller, and the option produces the exception: at the very top of the length-of-service list sit three women held back by the equipment they work at, one of whom is Kamala. The general tendency may hold over the shed as a whole and the conclusion about Kamala still be false. Nine new rollers change the shed's composition without saying anything about Kamala's count. How the count is entered bears on the record's accuracy, which nobody disputes. And payment by the thousand gives every roller a reason to roll more, which supports the tendency rather than breaking it.