In a study that examines the effects of stress on memory,which group would NOT be put under stress

A)  the experimental group
B)  the control group 
C)  the independent group
D)  the dependent group

Psychological factors can play a much greater role in helping to prevent ______ than in helping to prevent ______.

A) cancers; infectious diseases
B) cancers; influenza
C) influenza; chronic illnesses
D) chronic illnesses; infectious diseases

Some people claim that certain rock songs contain hidden messages that we can hear only if we play the music backwards. What have psychologists concluded about this claim?

A) Backward messages have powerful effects on most people.
B) Legal restraints have prevented rock groups from recording backward messages.
C) Backward messages affect only people who listen to the same song many times.
D) Even if backward messages are present, they have no effect on behavior.