Which of the following is not mentioned by the author as the causes of the decreasing popularity of libraries

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Which of the following is not mentioned by the author as the causes of the decreasing popularity of libraries?

1. People think that the most important information is on the Internet.
2. Libraries are associated with poverty.
3. People prefer e-books and great bookshops to libraries.
4. Profound changes are explained by the loss of interest in reading.