WHAT DOES THE WORD "THOSE" IN LINE 6 REFER TO

25. - DE THI HOC KI 1 ANH VAN 12 DE THI HKI12 1314 CHINH THUC
DE THI HOC KI 1 ANH VAN 12 DE THI HKI12 1314 CHINH THUC
25. What does the word "those" in line 6 refer to? A. Newspapers B. Job fairs C. Magazines D. The sites