Answer: Option C
Explanation: Social psychology is that branch of psychology that studies the behavior of an individual in a social context. The psychologists selects some individuals and studies their behavior in certain situations. After an extensive study of subject individuals the psychologist proposes a rigid and approved theory of human behavior.
On the other hand, folk theories are made by individuals based upon their individual observations of sequence of co-incidences.
Thus, from the above we can conclude that the correct option is C.