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? ['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.', 'The ranking system is not a fair way to determine penalties or rewards for workers.', 'Some companies require their managers to give unique rankings to the workers they supervise.', "Managers often give the highest rankings to workers who share the manager's outside interests."]