A master class student held a 20th-anniversary party for graduation. The contact person, Wang Ning, said that some students in the class could not attend. "The delegation secretary said," Lecturer, I don't think you're right. ". If the party branch secretary is wrong, which of the following must be false? ['Two of Qiuju, Achun, Xiuxiu, and Nannan can participate.', 'Qiu Ju, A Chun, Xiu Xiu, and Nan Nan cannot participate.', 'Qiu Ju, A Chun, Xiu Xiu, and Nan Nan can participate.', 'If Qiuju and Achun can participate, then Xiuxiu and Nannan can also participate.']