In the era of the popularity of smart phones, we send and receive messages every day. Electronic information exchange between people has become a unique way of communication in today's era. When facing important people or relationships, many people often send messages Just look forward to being returned, if not, they will have a sense of suspicion or abandonment, and they will fall into deep trouble and anxiety. Which of the following is most likely the assumption they need to fall into deep trouble and anxiety? ['The current technology has been able to achieve instant communication with smart phones, convenient and fast, and basically free of charge.', "Some chat software can feedback the message in the sender's mobile phone whether the receiver has read the message.", 'Some people are very busy at work, and they are used to processing related information after a busy day.', 'Some people receive too much information a day, and it is easy to miss important information that someone expects to return in seconds.']