This question presents a sentence, part of which or all of which is underlined. Beneath the sentence, you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise, choose one of the others.
One of the most difficult elements of teaching is to keep an objective stance when students are writing papers that, however indirectly, criticizes stances or choices that the teacher has taken in life; however, it is crucial that the teacher assess such papers fairly rather than allowing personal opinion and prejudice affect the grade.