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

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?

A) case study of an individual with social anxiety
B) single-case design examining the effects of imagery exercises in a person with social anxiety
C) epidemiological study to estimate the prevalence of social anxiety
D) experimental study examining the effects of group therapy (versus being waitlisted) on social anxiety

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