A pilot study was carried out in the experiment by Gentile et al. (2009) on the effects of video games on social behavior. The purpose of the study was to help ensure that the
a. different levels of the independent variable were appropriately constructed with respect to the nature of their social content
b. participants in the different experimental conditions were closely matched with respect to amount of experience playing video games
c. possible threats to experimental control were minimized by equating the circumstances under which the different experimental conditions were conducted
d. validity was not threatened
Ans: A
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