The threat of history refers to:
A) some subjects with have had history classes and others not
B) the realization that some subjects have learned from history while others have not
C) events external to the experiment that will impact the results
D) the fact that only current, relevant subjects need be studied

Question

Quizplus · Accepted Answer

The threat of history refers to external events that occur outside of the experiment but can affect its outcomes, potentially confounding the results.

The Threat of History Refers To