A Researcher Is Carrying Out a Quasi-Experimental Study

Multiple Choice

A researcher is carrying out a quasi-experimental study. She has experimental groups in one school, and a control group in another. During the intervention phase of her study, the control school has a small fire that forces students to leave the school for one hour. She finds huge differences between the experimental and control groups after the study is completed. While there could be an effect of her intervention, a possible rival hypothesis might be:

A) There was a maturation effect
B) There was an instrumentation effect
C) There was a differential history or selection-history effect
D) There was a selection-maturation effect