GMAT Critical Reasoning (CR) | Re: TV is the future because it remains king of all media

TV is the future because it remains king of all media. While handsets get hyped, the typical U.S. consumer watches more than 5 hours of TV a day, according to Nielsen, and even younger adults 18 to 24 years old—the supposed digital generation—spend 3 hours and 30 minutes on televisions daily compared to only 49 minutes on the Web and 20 minutes on mobile.

The above argument is most vulnerable to which of the following criticisms?

a) The argument fails to look into the possible causes of