Read the scenario below to determine which one of the threats to external validity (interaction between treatment and selection, interaction between treatment and location or interaction between treatment and history [time]) is of most concern. During the academic school year of 2019-2020 researchers completed a study on the impact of early childhood education on the social development of children.  The researchers selected programs in one county with plans to generalize the findings to the entire state.   A. Interaction of treatment and selection B. Interaction of treatment and location C. Interaction of treatment and history

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