Is it appropriate to create a one-proportion z-interval? A. It is not appropriate because whether a student graduates on time is independent of whether another student graduates on time. B. If that year's students (a cluster sample) are viewed as a representative sample of all possible students at the school, then it is appropriate to create a one-proportion z-interval. C. It is not appropriate because this is not a simple random sample and there is a possible nonresponse bias. D. It is not appropriate because the sample is a simple random sample