Which of the following is an example of purposive sampling?
A. Asking your female friends to respond to a survey via Facebook and Twitter requests.
B. Asking people who use a site's shopping cart how they feel about that experience.
C. Emailing a random sample of employees who started at the company this year based on a list provided by HR.
D. Asking one group of respondents to forward the survey invite to their social networks.
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