Certain companies require their managers to rank workers in the groups they supervise from best to worst, giving each worker a unique ranking based on job performance. The top 10 percent of the workers in each group are rewarded and the bottom 10 percent are penalized or fired. But this system is unfair to workers. Good workers could receive low rankings merely because they belong to groups of exceptionally good workers. Furthermore, managers often give the highest rankings to workers who share the manager’s interests outside of work.

Which one of the following most accurately expresses the conclusion drawn in the argument?

(A) Some companies require their managers to give unique rankings to the workers they supervise.
(B) Under the ranking system, the top 10 percent of the workers in each group are rewarded and the bottom 10 percent are penalized or fired.
(C) The ranking system is not a fair way to determine penalties or rewards for workers.
(D) Workers in exceptionally strong work groups are unfairly penalized under the ranking system.
(E) Managers often give the highest rankings to workers who share the manager’s outside interests.
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prototypevenom

D is incorrect because it is a premise supporting the main conclusion that the policy is unfair. E is similarly wrong.
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Can someone elaborate why D is wrong?

Thanks

IMO answer should be C (although I marked D initially).

Reasoning (after seeing the correct answer)-

Question stem- "most accurately expresses the conclusion drawn in the argument?"

Conclusion- The system is unfair to workers.

Option C is saying that the ranking system is not a fair way...which is same as the conclusion drawn in the argument.

Whereas in Option D, it says the reason(one of the many) why the rating system is unfair. It's quite an attractive choice (which fooled me in the first place).?

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