<s>[INST] context: E-book is short for electronic( ) book. It is usually read on personal computers. Some
mobile phones can also be used to read e-books.
Earlier e-books were written for a specific group of readers and were about only a few subjects. With the development of the internet, knowledge and answers to a lot of questions mainly come from e-books. This is why the e-book business is increasing quickly
E-books have many advantages. First, they save time. We don't need to go to a bookstore to buy books, besides, we can find the topic we want to know about on the Internet, and then we can quickly get many e-books on similar topics. Second, e-books save money. Some e-books cost a little money, and there are millions of e-books on the Internet that we can get for free. Third, more trees are saved because e-books don't need to be printed  on paper. Fourth, e-books make reading more convenient. You can carry a whole library of hundreds of books with you in a small computer or any e-book reader   without worrying about their weight.
But e-books have certain disadvantages. They need a personal computer or an e-book reader and the information can be lost if its file format   is not supported or changed in the reader's computer.
However, e-books provide us with a new way of reading. That is good.
,. [/INST] question: Why is the e-book business increasing quickly? Because   _  . | options: A: earlier e-books are about only a few subjects B: people don't like to read any paper books any more C: most e-books have been written for a specific group of readers D: the development of the Internet makes e-books more useful | answer: D </s>