Stratified random sampling is a way to ensure that
a. individuals important to the researcher are selected into a sample
b. research participants have a chance to nominate other individuals to join the study
c. small but important subgroups of a population are captured in a sample
d. research participants have an opportunity to shape the research project
e. the level of error in the research results is minimized
c. small but important subgroups of a population are captured in a sample
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