A researcher is studying the effects of
negative outcomes on the human brain in
a psychological experiment. The
researcher shows ten participants various pictures
and designs. When the participants see a red star,
they are immediately given a brief, painful shock
and their brainwaves are analyzed. A different
group of ten participants is given the same
pictures and designs but are given no shock when
they see the red star.
What was the control in the experiment?

A.The picture of the red star.
B.The group that is given no
shock.
C.The electrical shock.
D.The pictures and designs.