In a recent study on the connection between brain abnormalities and violent
behavior, the researcher examined more than three hundred people who had
engaged in unusually violent behavior toward friends and family members. In
most of the people studied, the researcher found clues of brain abnormalities,
including evidence of past brain injury and physical abnormality. The researcher
concluded that evidence of brain abnormalities could be used to predict
Which of the following, if true, would most
seriously weaken the researcher’s
A. The incidence of brain abnormaiities in the generai popuiation is as high as
that in the group examined.
B. The brain abnormaiities discovered in
those studied are of two distinct kinds
C. A wide variety of vioient actions were
exhibited by those studied.
D. Those studied in the experiment acted vioientiy toward strangers as
well as toward peopie they knew.
E. The study drew its subjects from a large geographical area.