One Psychologist Says, "Depression Stems from Unconscious Feelings of Anger

One psychologist says, "Depression stems from unconscious feelings of anger and abandonment that go back to childhood." Another psychologist says, "Depression is caused by illogical thoughts and assumptions." These differences of opinion ____.

A) illustrate the difficulty of science being self-correcting when there are different theories involved
B) suggest that psychology is not really a science
C) indicate that hypotheses typically reflect the same theoretical position
D) show that hypothesized reasons for one disorder can have different theories behind them