Which Statement Is the MOST Accurate Conclusion About the Current

Which statement is the MOST accurate conclusion about the current state of abnormal psychology in the United States?

A) There is no single definition of abnormality or theoretical understanding of mental illness causes.
B) We do know what mental illness is,but we do not understand the best way to treat it.
C) We have returned back to the demonology era.
D) Today,we understand what causes mental illness and how best to treat it; we can also define it.