Dr.Greene would like to conduct an externally valid study on the topic of social anxiety.Which study methodology below is most likely to yield results that are externally valid?

Question

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An epidemiological study would involve a large sample size and look at the prevalence of social anxiety in a population, which would increase the likelihood of external validity. Case studies (A) and single-case designs (B) involve only one individual and may not be generalizable to the broader population. An experimental study (D) could have high internal validity, but may not be externally valid if the sample of participants doesn't represent the larger population.

DrGreene Would Like to Conduct an Externally Valid Study on the Topic