Read the passage below carefully, and then choose the best answer:
The Rise of E-books
Over the past decade, e-books have revolutionized the way people consume written formation. It will probably come as no surprise the total global sales number continues to rise each year. There are several reasons why readers are buying more e-books. For starters, reading a lengths e-book in front of your computer isn't the most comfortable thing to do. But since tablet sales have exploded, readers can now relax and read their favourite e-books in bed from the beach. Many e-books are often sold at lower prices than traditional books. Since there is almost zero cost for producing e-books, some authors are offering their novels at lower prices. Another factor is convenience. In the past, keeping a large book collection meant setting aside a lot of extra space in one's home. With e-books, it is now possible for readers to carry a portable library, which contains thousands of books. To really understand e-book market though, it is important to keep up with national trends. Recent data suggests that the e-book market in the US and the UK have matured. In both of these countries, e-book sales account for roughly 20 percent of overall book sales. Although that percentage continues to increase, it is going up at a slower rate than in the past. The popularity of e-books has exploded in Russia. In one poll, 70 percent of Russians claim to have read at least one e-book. However, publishers are not too pleased with this new because approximately 92 percent of e-books in Russia are acquired illegally. In France, consumers don't appear to be loo keen on e-books at this time. Although in 2012, e-book sales comprised about 3 percent of the market, it is predicted that this number will increase at a very slow pace. Some French people believe that reading e-books on small screens is uncomfortable. Others say that the French are a cultural exception, as they like the feeling of holding a dusty old physical book. This demonstrates that no matter how popular e- books get, it is unlikely that traditional books will disappear any time soon.
5. The word "they" in paragraph 5 refers to _____

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