Every kth element in a list is chosen for inclusion in the sample in :

Every kth element in a list is chosen for inclusion in the sample in
 
  A) simple random sampling.
 B)systematic sampling.
 C)disproportionate sampling.
 D) cluster sampling.
 E) stratified sampling.

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A researcher randomly selects cities, then randomly selects churches in each selected city, and the randomly selects members to be interviewed in each selected church. This research is using
 
  A) simple random sampling.
 B)quota sampling.
 C)multistage cluster sampling.
 D) stratified sampling.
 E) accidental sampling.

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You are doing research on hospital personnel-orderlies, technicians, nurses, and doctors. You want to be sure you draw a sample that has cases in each of the personnel categories. You want to use probability sampling. An appropriate strategy would be
 
  A) simple random sampling.
 B)quota sampling.
 C)cluster sampling.
 D) stratified sampling.
 E) accidental sampling.