Which Is a Major Contribution of Kelly

Multiple Choice

Which is a major contribution of Kelly?

A) He has developed a theory that illuminates the subtle nuances of the parent-child relationship.
B) He has been one of the few psychologists to highlight the importance of the cognitive approach.
C) He has been responsible for one of the most thorough research programs on record.
D) He has been among the relatively few psychologists who has promoted the "one subject, one client at a time" approach.