A Problem with Self-Report Measures of Depression,such as the Beck

A problem with self-report measures of depression,such as the Beck Depression Inventory,is that

A) testtakers can fake depression or fake the absence of depression.
B) they are highly unreliable and based solely on what happened to the testtaker during the previous day or so.
C) they do not gauge the severity of depression, only its presence or absence.
D) the theory on which they are based has been shown to be severely flawed.