Critical Reasoning

The growing popularity of computer-based activities was widely expected to result in a decline in television viewing, since it had been assumed that people lack sufficient free time to maintain current television-viewing levels while spending increasing amounts of free time on the computer. That assumption, however, is evidently false: in a recent mail survey concerning media use, a very large majority of respondents who report increasing time spent per week using computers report no change in time spent watching television.

In order to evaluate the argument, it would be most useful to determine which of the following?
A Whether a large majority of the survey respondents reported watching television regularly
B Whether the amount of time spent watching television is declining among people who report that they rarely or never use computers
C Whether the type of television programs a person watches tends to change as the amount of time spent per week using computers increases
D Whether a large majority of the computer owners in the survey reported spending increasing amounts of time per week using computers
E Whether the survey respondents' reports of time spent using computers included time spent using computers at work
The OA is E. I can understand the correct answer but I think choice A is also correct. I will give an extreme example. We can assume a person watch TV once a year and only 2 hours generally and he has a large amount of free time everyday such as 8 hours. He can increase the time cost on computer for fun from 2 hours to 4 hours a day and it will not affect he spends 2 hours a year to watch TV.
Can someone correct me?
Thanks in advance!