D is the answer in my view.Premise: At Siemans University, 30 percent of varsity athletes receive full scholarships. But their high school GPAs are, on average, a full point below those of non-varsity athletes at this school.
Conclusion: Siemans University should be forced to stop giving unfair advantages to athletes.
So, the author of the argument concludes that Siemans University should be forced to stop giving unfair advantages to athletes because the 30% varsity athletes that are given full scholarship by the school have lower high school GPAs than those of non-varsity athletes at the school.
To weaken the argument above, we need to find an alternative rationale for the decision of the school to offer full scholarships to 30% athletes rather than on the basis of the athlete's high school GPA.
A: Varsity athletes account for only 4 percent of the student body. This is irrelevant. The proportion of the athletes compared to the total student body is irrelevant and does not weaken the argument above. We need a rationale, a basis for their preferential treatment although they have lower high school GPAs.
B: Admissions policies cannot be revised unless ¡t can be proven that the university is acting unfairly. This is also irrelevant to the argument. It does not provide a rationale for the perceived biased towards athletes by the school.
C: Approximately 90% of university orchestra, members of the university debate team and students working on the university newspaper receive full scholarships. This is also irrelevant to the argument and does not weaken the conclusion of the author. Who knows, the 90% who receive full scholarship could have stellar academic records in high school, justifying the argument by the author, or they might not have high GPAs, thereby weakening the argument of the author.
D: Historically, Siemans University has done poorly in sports and is trying to attract better athletic talent. This is correct. So Siemans University is actually offering full scholarships to athletes with lower GPAs to attract these athletes to the school. This weakens the conclusion of the author above because we have come to know through D that the university is not offering full scholarships to the athletes based on their high school GPAs. It is using it as an incentive in order to improve its poor performance in sporting competitions.
E:Varsity athletes’ standardized test scores are lower than the school’s averages. This strengthens conclusion drawn by the author above.