Why B is not true?

Consider the following statements: A. If the frame from which the sample is selected displays a pattern, then using systematic sampling could lead to an unrepresentative sample being selected. B. In both cluster sampling and stratified sampling the population is first divided into homogenous stratum. Selected Answer: 0 both A and B are true Answers: 6 only A is true only B is true both A and B are true neither A nor B are true