External validity of an aspect refers to a validity of a condition and the results being interpreted whether they are applicable to the real world or not.
The correct statement is that a study has a high external validity when strong inferences can be made that one variable caused changes in the other variable.
External validity relates to the dependability of the results based upon the internal validity and the changes which occurred due to the external factors that affected the results of the study.
For example, when a demand for products, say face masks and sanitizers, increases due to a virus outbreak, the virus outbreak is the external factor and the increase in demand is the study of the external validity.
Hence, the correct statement is that a study has a high external validity when strong inferences can be made that one variable caused changes in the other variable.
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