<span>The threat to internal validity is the Mortality. Internal
validity is the measure in which the causality of the stimuli studied
is analyzed, that is, if the results of the study are due to the
interaction of the variables analyzed or are due to the interaction with
other variables. <span>Mortality is an error that occurs if the
conclusions of the study are made only on the basis of the participants
who were from beginning to end in the investigation, without taking into
account those who left the study.
I hope my answer can help you.
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I believe the answer is: D.<span>. openly known and easily stated by most citizens
According to Edward, these rules usually would be introduced by each members of the social group right before they become the member of that social group. Examples of such rules are the employee orientation that companies do for new recruits.</span>
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