A hand therapy research group is attempting to determine whether the experiment caused a change in the dependent variable in a study that used orthoses as the OT intervention in relation to contracture prevention, or whether issues related to the actual passage of time and or accuracy of the tool used to measure the contractures were responsible for the results. The research group is looking at which of the following
a. study bias
b. external validity
c. internal validity
d. context specificity

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