Please answer correctly

Graders who use a red pen

The answer is:

A. They are more accurate with their corrections.

Explanation:

The use of red pen to grade has been traditional with teachers.  The colour helps them to differentiate the students' work from the corrections made by the teachers.  It also stands out prominently as distinct from the original work by the students.

However, recent researches have shown that it could have some negative effects on the students.  For one, it is suspected to alienate the students from their teachers.  Two, it could aggravate negative feelings in the students because of the sharpness of the red ink.

It is advised that teachers should choose other neutral colours in grading students.  They could use blue if the student used black and vice versa.