The manager of a local craft shop wants to conduct a survey to see what color will be popular among his customers during the upcoming season. He decides to poll every fifth customer that enters the shop for two weeks.
Are the results of the survey valid?

A.
No. The manager used a sample that represents the entire population of customers but is not randomly chosen.
B.
No. The manager used a sample that was randomly chosen but does not represent the entire population of customers.
C.
Yes. The manager used a sample that was randomly chosen and represents the entire population of his customers.
D.
No. The manager used a sample that neither represents the entire population of customers nor is randomly chosen.