請依下文回答第 21 題至第 25 題 　　History has not yet revealed what we will definitely call the postmillennial cohort that now numbers morethan 60 million people in the U.S. These kids and teens with no concept of life without the Internet have so farbeen called the App Generation and Generation Z. They’ve been referred to as Homelanders, having grown upunder the specter of terrorism. They’ve also been labeled the Plurals, for their historic diversity, as well as theFounders, at least by MTV. 　　Whatever we end up naming them, marketers and academics are turning their attention to this group,which has billions in buying power and is already shaping the culture. This generation is growing up “totallyand utterly connected,” says California State University psychologist Larry Rosen. Experts like Rosen haveconcerns about these kids’ Google-fostered expectations that everything be instantaneous. They worry abouttheir inability to tolerate even five seconds of boredom. And they fret about the demands that come withmaintaining several identities online, from Facebook to Instagram to Snapchat. “There’s so much pressure onyoung people, who are still forming their identities, to present this crystallized, idealized identify online,” saysKatie Davis from University of Washington. 　　There is also optimism about a generation that is asserting an entrepreneurial spirit and finding ways toget offline. These kids’ uberprotective Gen X parents-determined not to raise latchkey kids like themselves-aremeanwhile hovering and helping them digitally detox in screenless camps and Waldorf schools. 　　Historian Neil Howe sees parallels with the Silent Generation, the doted-on, risk-averse, “nice” generationof kids who grew up during the Great Depression and World War II. Today’s youths are also coming of ageamid geopolitical turmoil and fears about the economy, he says, while schools emphasize “a profoundsensitivity to other kids.” He suspects this generation will be known for being well behaved and perhaps“blanding” the culture by playing it safe. “There are recurring archetypes,” says Howe, even if they go bydifferent names.
21 What is the main idea of this article?
(A) To discuss the traits and problems of the Gen Z.
(B) To explore the Gen Z's relationship with the Internet.
(C) To argue that the Gen Z is defining American culture.
(D) To suggest that the Gen Z will replicate the Silent Gen.