Paragraph 4: They're the World of Warcraft fans who are so intent on mastering the challenges of their favorite game that, collectively, they've written a quarter of a million wiki articles about the fictional universe—creating a wiki resource nearly one-tenth the size of the entire Wikipedia. They're the Brain Age and Mario Kart players who take handheld game consoles everywhere they go, sneaking in short puzzles, races, and minigames as often as possible, and as a result nearly eliminating mental downtime from their lives. Paragraph 5: They're the United States troops stationed overseas who dedicate so many hours a week to burnishing their Halo 3 in-game service record that earning virtual combat medals is widely known as the most popular activity for off-duty soldiers. They're the young adults in China who have spent so much play money or “QQ coins,” on magical swords and other powerful game objects that the People's Bank of China intervened to prevent the devaluation of the yuan, China's real-world currency.

Which part of the initial claim is best supported by paragraphs 4 and 5? (Refer to specific words and phrases in the opening claim as you answer this question.)