A researcher wishes to determine the average number of text messages per month sent by high school students who have cell phones. A) Ask a random sample of 100 students how many text messages they send. B) Ask a random sample of 100 students with cell phones how many text messages they send. C) Interview 100 students in the mall who are seen talking on their cell phones. D) Randomly select the cell phone records of 100 high school students.

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