ALL BUT WHICH of the Following Has Been a Common

ALL BUT WHICH of the following has been a common criticism of biofeedback?

A) Biofeedback may not be more effective than other, less expensive, techniques.
B) Studies on biofeedback have not always been able to separate the effects of biofeedback from the effects of other treatments included in the same treatment package.
C) Biofeedback may be harmful, depending on the nature of the health condition.
D) Rightly or wrongly, biofeedback has a reputation for being faddish or cultish.