The quote from the text that shows that the author’s purpose is to persuade is D. Critics say that kids stare at computers and TVs all day and do not get enough exercise. The facts stand in counterpoint to this belief.
An argumentative writing prompt is written in order to convince the readers about a particular issue.
According to the author, the fact that children are involved in watching movies, playing games, listening to music, etc doesn't mean that they can't still be productive.
There are some critics that believe that kids stare at computers and TVs all day and do not get enough exercise. This was countered by the author who stated that kids can still engage in exercises or do other productive things.
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