The Placebo Effect, Where Positive Expectations Lead to an Improvement

The placebo effect, where positive expectations lead to an improvement in a client's situation,

A) should be evidence that psychotherapy interventions really aren't all that beneficial.
B) are unique to psychotherapy, and should be capitalized upon.
C) highlights the role that faith, hope, and expectation for change contribute to therapeutic change.
D) cannot be manipulated, so they are not important to the therapeutic alliance.