B

has to be B , that is the only logical answer which weakens the argument.
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What is of supreme importance in war is to attack the enemy's strategy.

its a clean B here.
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+1 for B

IMHO 'B', though it doesn't really weakens the argument cause argument says "eventually" but then this is the best option we have.
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--Syed
" Some are desperate for success, and therefore destined for it."

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.

Premise: Avg. salary for college grad jobs > Avg. salary for other jobs
No. of ppl enrolling in college has been increasing steadily.
Conclusion: therefore the no. of ppl who have a college degree will be greater than that of prev. 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. Irrelevant.
B. The average number of years Kravonian college students remain enrolled before completing a degree has been increasing over the past several of years. Seems correct. If the avg. no. of years a student remains in college increases, then the no. of college grad taking jobs may not increase.
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. Irrelevant. We are not bothered about 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.Strengthens the argument. The employers want more ppl with coll. degrees. The number of college students is also increasing.
E. For many years, employers in Kravonia have had difficulty finding enough college graduates to fill the high-paying jobs that were available.Irrelevant.