A population has groups that have a small amount of variation within them, but large variation among or between the groups themselves.
The proper sampling technique is:

A. simple random.
B. stratified.
C. cluster.
D. judgment.

B. stratified.

Step-by-step explanation:

If a population is composed by identifiable groups or strata, with large variations between groups, the stratified sampling should be applied in order to comprehend and represent all of the different groups in the sampling process.

Therefore, the answer is  alternative B. stratified.

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