Đọc đoạn văn và chọn câu trả lời phù hợp nhất cho mỗi câu sau.

It is often considered that the schoolyard is where bullies go to make other kids a miserable school life, but a new study suggests that classrooms are another popular place. The study, presented recently at the American Public Health Association’s yearly meeting in Philadelphia, is based on the results of the research from more than 10,000 middle school students who answered questions online.

According to researched students, 43% said they were physically bullied within the last month. Half of them said they were laughed at in an unfriendly way, and half reported being called hurtful names. About one third said groups excluded them to hurt their feelings. 28% said their belongings were taken or broken; 21% said someone threatened to hurt them. According to the results, two-thirds of the students said they were bullied in more than one way over the previous month.

The study authors mentioned that 8% of the students who answered said they missed school at least once during the school year because of fear of being bullied. 25% said they took other actions, such as missing recess, not going to the bathroom or lunch, missing classes, or staying away from some areas of the school to escape from experiencing a bully. Bullies did too much to the school life.

What is the percentage of students who were laughed at in an unfriendly way?