Hi !!
The answer is validity, i am very sure :).
Answer:
It illustrates INSTRUMENTATION as a threat to the internal validity of the experiment.
The correct answer to this question is:
Courts of Appellate
<span>The courts of appellate or most
commonly known as courts of appeals is any court of law that is empowered to heed
an appeal of a trial court or other lower tribunal. It is the authority of a
higher court to re-examine decisions and alter outcomes of decisions of lower
courts.</span>