The following are letters to the editor of a school newspaper  
Dear editor,
I’d like to express my opinion about grades. Students should be allowed to study without worrying about grades. Fortunately, most educators are becoming aware of the fact that students have different interests and abilities. I understand that grades are useful, but grades often limit creativity. Competing for better grades causes many students to turn down opportunities to pursue music, dramatics and sports. Grades force an arbitrary(武断的) standard of success on everyone. I do not demand as some extremists do, that grades be removed immediately. However, I do believe that less emphasis should be placed on grades. I hope that someday grades will become optional at Village High School.
Magdalena Smith
Drama Club
Dear editor,
I’d like to say something about grades. Let’s face the facts about grades. Grades perform three basic functions. First, grades motivate students to work at their highest level of competence. Second, they act as a reward for hardworking students and as a punishment to students who do not work hard. Finally, grades are used as an effective standard by which to measure student achievement. Good grades help students to get jobs and to get into university. I've spoken with a number of students who have jobs, and most of them say that they were hired primarily on the basis of their grades. My grades helped me land a part-time job and will help me get into university next year. I think grades are extremely important at Village High School.
Simon Harper
Science Club
Which of the following is not Magdalena Smith’s opinion?

A．Students may give up the chance to learn music and sports for grades.

B．Students’ creativity may not be developed for grades.

C．Grades should not be used to measure a person’s success.

D．Grades should be taken away at once.

We can learn Simon Harper _____.

A．believes in the benefits of good grades

B．is concerned about students' creativity

C．doesn't work too hard at his studies

D．supports students' interests and abilities

From the second letter, we can infer that Simon Harper is a/an_____.

A．teacher

B．headmaster

C．student

D．advertiser