When a Sample Is Nonrandom, There Are Some Important Ways

When a sample is nonrandom, there are some important ways to improve the researchers' ability to generalize their study results. Which one of the following sampling strategies does NOT improve the nonrandom sampling process?

A) A sample for a study of alcohol use among high school students was solicited from multiple high schools.
B) A sample for a study of mental health needs of homeless people was solicited from several homeless shelters.
C) A sample for a study of local-area parents was solicited at various school and community events for parents.
D) A sample for a study of young adults was solicited from several classes at a local college where the researcher works.

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