You Are a New Researcher in a Social Psychology Lab

You are a new researcher in a social psychology lab.The study you are working on is examining the effects of______________alcohol on aggressiveness.You are aware of the hypotheses of the study and eager to find evidence that supports them,and you find yourself acting in a less polite manner with participants who are assigned to the alcohol condition. This differential treatment of participants across conditions will threaten

A) the statistical significance of the results.
B) the internal validity of the study.
C) the external validity of the study.
D) the interrater reliability of the study.