Each week, several testakers around the world score 680

Each week, several testakers around the world score 680 points or higher on the computerized GMAT exam. Since scoring high on the GMAT requires specific content knowledge and refined pacing skills, all of such high scorers could serve as good GMAT teachers.

Which of the following, if true, most weakens the argument above?

A. Most high scoring GMAT testakers tend to be non-native English speakers.

B. Most high scoring GMAT testakers have little or no standardized exam teaching experience.

C. Teaching a test of any kind requires a specific licence or qualification.

D. Most high scoring GMAT testakers would not be enticed by the relatively low wages offered by large test prep organizations.

E. Most high scoring GMAT testakers tend to be extremely strong in either math or verbal, but not both aspects of the exam.