11: People who question whether the number of electric shocks administered to
an experimental confederate really measures aggressive behavior are questioning
the __________ validity of experiments that use this technique.

B: external

     Incorrect.

External validity asks the question "do these results apply everywhere, or
just in this place at this time?" If a study has high external validity, the
results apply in a lot of situations, and if it has low external validity, it
applies in a limited amount of situations.  Since questioning whether shocks
are a good analog for aggression is not  related to external validity,
this answer is incorrect.