More teens in the U.S. suffer from mild hearing loss today than teens did 10 years ago. Scientists blame this increase among teens on the rise in popularity of using earphones to listen to MP3 players. A large number of teens report that they do not believe that they listen to music at a level loud enough to affect their hearing ability. Scientists counter that most teens do not realize that the volume of their MP3 players is loud enough to affect young ears.

What would be a better persuasive device for the author to use?
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naming the earphone brands that have caused the least amount of hearing loss among teens in the U.S.
listing the most popular brands of MP3 players that are used by teens in the U.S. today
giving the statistics of how many more teens in the U.S. are experiencing hearing loss today than teens did 10 years ago
presenting the total number of MP3 players sold to and used by teens in the U.S. over the last two years

Giving the statistics of how many more teens in the U.S. are experiencing hearing loss today than teens did 10 years ago would be a better persuasive device for the author to use. This would provide concrete evidence to support the fact that there is an increase in hearing loss among teens and would help to convince readers of the impact of using earphones to listen to MP3 players.