Which of the following most ligically completes the argument?

The growing popularity of computer-based activities was widely predicted to result in a corresonding decline in television viewing. Recent studies have found that, in the United States, people who own computers watch, on average, significantly less television than people who do not own computers. In itself, however, this finding does very little to show that computer use tends to reduce television viewing time, since_______.

(A) many people who watch little or no television do not own a computer - this is out of scope, we are not concerned with people who watch little television
(B) even though most computer owners in the United States watch significantly less television than the national average, some computer owners watch far more television than the national average - out of scope again, the stimulus no where talks about 'National average'
(C) computer owners in the United States predominately belong to a demographic group that have long been known to spend less time watching television than the population as a whole does- not realted, we are just concerened with people, who have computers, and television - we are not considering the whole population
(D) many computer owners in the United States have enough leisure time that spending significant amounts of time on the computer still leaves ample time for watching television - the best of all.
(E) many people use their computers primarily for tasks such as correspondence that can be done more rapidly on the computer, and doing so leaves more leisure time for watching television- this ans choice is too specific, foucussing just on the tasks and the speed with which they can be done.


Let the thoughts fly. If you're going to post an answer, please follow it up with your reasoning. Not looking for random guesses--I already tried that approach and it didn't work.

Which of the following most ligically completes the argument?

The growing popularity of computer-based activities was widely predicted to result in a corresonding decline in television viewing. Recent studies have found that, in the United States, people who own computers watch, on average, significantly less television than people who do not own computers. In itself, however, this finding does very little to show that computer use tends to reduce television viewing time, since_______.

(A) many people who watch little or no television do not own a computer.
(B) even though most computer owners in the United States watch significantly less television than the national average, some computer owners watch far more television than the national average.
(C) computer owners in the United States predominately belong to a demographic group that have long been known to spend less time watching television than the population as a whole does.
(D) many computer owners in the United States have enough leisure time that spending significant amounts of time on the computer still leaves ample time for watching television.
(E) many people use their computers primarily for tasks such as correspondence that can be done more rapidly on the computer, and doing so leaves more leisure time for watching television.

Let the thoughts fly. If you're going to post an answer, please follow it up with your reasoning. Not looking for random guesses--I already tried that approach and it didn't work.

IMO C

Evidence: Study showing people who own computers less television than people who do not own computers.
Conclusion: Television viewing has declined due to computers.

Question has been asked to weaken the argument.

(A) many people who watch little or no television do not own a computer. -Irrelevant, since we are concerned about comparison between TV and computer, rather then between TV and non-computer.
(B) even though most computer owners in the United States watch significantly less television than the national average, some computer owners watch far more television than the national average. -Irrelevant, its just talking about some computer owners watching TV.
(C) computer owners in the United States predominately belong to a demographic group that have long been known to spend less time watching television than the population as a whole does. -Correct, weakens the argument by directly challenging the conclusion, even though the survey result is correct as the survey is giving average results.
(D) many computer owners in the United States have enough leisure time that spending significant amounts of time on the computer still leaves ample time for watching television. -Irrelevant, we are just concerned about comparing two different group of people, i.e computer owners and non-computer owners. Doesn't matter if computer owners are spending lot of time on TV, but we don't know if non-computer owners are spending even more time
(E) many people use their computers primarily for tasks such as correspondence that can be done more rapidly on the computer, and doing so leaves more leisure time for watching television. -Same error, as in D