The observational method is extremely useful in helping us describe social behavior. The correlational method is extremely useful in helping us understand what aspects of social behaviors are related. However, only a properly executed experiment allows us to draw conclusions about cause and effect. For this reason, the experimental method is the most commonly used research design in social psychology.
a Argument; conclusion: Only a properly executed . . . cause and effect.
b Argument; conclusion: The experimental method . . . in social psychology.
c Argument; conclusion: The observational method . . . social behavior.
d Argument; conclusion: The correlational method . . . are related.