Sally Has Been Suffering from Depression and Finally Decides to Seek

Multiple Choice

Sally has been suffering from depression and finally decides to seek help from a clinical psychologist.After a couple of months of therapy,Sally's depression starts to lift.However,her improvement really isn't due to any of the therapy she has received from her therapist but instead is a product of Sally's expectation that psychotherapy is supposed to be effective and therefore she should be getting better.This example is best considered as an example of:

A) an experimenter expectancy effect.
B) the double-blind effect.
C) the placebo effect.
D) demand characteristics.