An Experimental Researcher Is Attempting to Determine If a Cognitive

An experimental researcher is attempting to determine if a cognitive intervention technique increases social awareness among violent offenders. To mitigate the potential for pre-test bias a researcher used two different tests to measure social awareness. The researcher later learns that the two tests (one used for the pre-test and the other for the post-test) were developed to measure separate parts of this concept. What type of threat to the internal validity of this experiment's results is this p

A) Maturation
B) Mortality
C) Testing
D) Instrumentation

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