Question: If a researcher selects a sample from each of the following populations, then which is likely to be a probability sample and which is likely

If a researcher selects a sample from each of the following populations, then which is likely to be a probability sample and which is likely to be a non-probability sample?
a. The population consists of the children enrolled in a prekindergarten program in a local school district.
b. The population consists of adolescents from single- parent families.

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