(A) A large number of the students whom the teacher evaluated were boys. --> Add no value to the argument as they are in %.
(B) Many teachers find it difficult to be objective when awarding marks to the students since they always have a personal bias/favorites.--> OOS
(C) The teacher is baised against the boys who complained that boys who did not complain to the officials.--> OOS
(D) The partiality against boys that the teacher is accused of, have been of boys who did not pass in at least one other subject.--> OOS
(E) The evidence shows the greater % of boys should have passed, while fewer of girls should have passed, than the final numbers. --> correct answer this shows that the teacher was partial