Read the scenario below. What is your biggest concern regarding external validity? Ninety undergraduate students were recruited for the study via an advertisement in the local student newspaper, flyers posted around campus, and an information table set up towards the entrance of the main library.  To participate in the study students needed to be over 18 years of age, currently enrolled as and undergraduate students, and inexperienced with any type of library instruction at the University. A. Interaction between the treatment and selection B. Interaction of the treatment and location C. Interaction of the treatment and history

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