A limitation of Dr. Norris's research based on this information is A. external validity.
External validity simply means the application of the outcome of a study to other areas. It simply means the generalization of a particular study.
External validity is the application of the conclusions of a study outside where the study was carried out.
In this case, Dr. Norris's research samples generally include young white men and women under the age of 30 years old. This shows that only whites were used and blacks weren't used for the research process.
Therefore, the limitation of Dr. Norris's research based on this information is external validity.
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