Can someone please help me with 1,2 and 5?

Which of the following expresses a central idea of the article “are our phones making us zombies? ”

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What is the problem with the following sentence: cameron, who has an extreme and unreasonable suspicion of other people and their motives, suffers from paranoia which is a psychological disorder characterized by delusions of persecution or grandeur, was absolutely sure that someone was following him even though he was absolutely alone and hadn't seen a car for miles and miles.