Read the following SAT test question and then click on a button to select your answer.

A consumer-monitoring service wants to determine television viewing habits among 18- to 29-year-olds in a particular city. Which of the following survey methods is most likely to produce valid results?

A.Select a random sample of 1000 18- to 29-year-olds in that city.
B.Select a random sample of 1000 18- to 29-year-olds in that city who attended a computer camp when they were in high school.
C.Select a random sample of 1000 18- to 29-year-olds in that city who played a varsity sport in high school.
D.Select a random sample of 1000 18- to 29-year-olds in that city who played chess in high school.

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