In Kravonia, the average salary for jobs requiring a college degree has
always been higher than the average salary for jobs that do not require
a degree. Over the last few years, the number of Kravonians enrolled in
college has been growing steadily. Therefore, the number of Kravonians
entering the job market who have at least the qualification of a college
degree will eventually be significantly higher than it has been over the
last few years.
Which of the following, if true, most seriously weakens the argument?
A. Kravonians with more than one college degree earn little more, on
average, than do Kravonians with only one college degree.
B. The average number of years Kravonian college students remain
enrolled before completing a degree has been increasing over
the past several years.
C. Despite the increase in the number of Kravonians attending college,
the percentage of the population attending college is lower in
Kravonia than in most other countries.
D. In recent years, employers have been requiring college degrees for
workers in jobs that were previously performed successfully by
Kravonians who did not have college degrees.
E. For many years, employers in Kravonia have had difficulty finding
enough college graduates to fill the high-paying jobs that were available.
答案是B，我在排除後可以選擇B，但就是想不通怎麼去weaken...
請大大幫個忙
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