Cluster sampling is different from stratified sampling in that ______.
A. cluster sampling is a type of probability sampling method whereas stratified sampling is a type of nonprobability sampling method
B. a random sample of individuals in each subgroup are included using cluster sampling, whereas some subgroups are omitted from a sample using stratified sampling
C. cluster sampling is a type of nonprobability sampling method, whereas stratified sampling is a type of probability sampling method
D. some subgroups are omitted from a sample using cluster sampling, whereas a random sample of individuals in each subgroup are included in a sample using stratified sampling.
Answer: D
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