Selective attention means that in many external stimuli, people only notice certain stimuli or certain aspects of stimuli, and ignore other stimuli. According to the above definition, which of the following is selective attention? ['Volunteer Xiao Zhang is busy with the services of the Olympic venue during the Olympic Games and has no time to watch the Olympic Games.', 'After the Olympics, some students are still overwhelmed by the exciting events in the Olympics and are unable to devote themselves to the study life of the new semester.', 'After watching the opening ceremony of the Beijing Olympics, the young man Mark from Italy became interested in Chinese culture, so he stayed in Beijing to learn Chinese.', 'During the Beijing Olympics, the couple who had been divorced. Due to watching the Olympics programs together, the communication increased, the relationship was relaxed, and the divorce was no longer caused.']