In an experiment, the researcher was unintentionally talkative to one of the participant groups. What best describes the threat to internal validity and why is it a threat?
A) Randomness, since being talkative can make this particular group more relaxed and better able to perform.
B) Participant-maturation interaction, since being friendly to one group can introduce a confound.
C) History, since this unintended interaction was not part of the independent variable, a confound was introduced.
D) Testing, since the other group might feel cheated for being treated more formally by the researcher, and this introduces counterbalancing.
Correct Answer:
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