People with the personality type constitute 5 percent of the medical profession. Teachers with the personality type are more likely to quit teaching than those with other personality types. Students of teachers with the personality type are intensely recruited for noneducational professions. People with the personality type constitute 5 percent of college students pursuing a degree in education.
In a study in which secondary school students were asked to identify the teachers they liked the best, the teachers most often identified possessed a personality that constitutes 20 percent of the general public but only 5 percent of teachers. Thus something must discourage the people who would be the best-liked teachers from entering the profession.
Which of the following, if true, most weakens the argument?