OG13-100，解释越看越迷糊啊，求解释！

100. Debater: The average amount ofovertime per month worked by an employee in the manufacturing division of theHaglut Corporation is 14 hours. Most employees of the Haglut Corporation workin the manufacturing division. Furthermore, the average amount of overtime permonth worked by any employee in the company generally does not fluctuate muchfrom month to month. Therefore, each month, most employees of the HaglutCorporation almost certainly work at least some overtime.

The debater’s argument is most vulnerableto criticism on which of these grounds?

(A) It takes for granted that themanufacturing division is a typical division of the corporation with regard tothe average amount of overtime its employees work each month.

(B) It takes for granted that if a certainaverage amount of overtime is worked each month by each employee of the HaglutCorporation, then approximately the same amount of overtime must be worked eachmonth by each employee of the manufacturing division.

(C) It confuses a claim from which theargument’s conclusion about the Haglut Corporation would necessarily followwith a claim that would follow from the argument’s conclusion only with a highdegree of probability.

(D) It overlooks the possibility that evenif, on average, a certain amount of overtime is worked by the members of somegroup, many members of that group may work no overtime at all.

(E) It overlooks the possibility that evenif most employees of the corporation work some overtime each month, any onecorporate employee may, in some months, work no overtime.