Psychologist: Doctors should never prescribe sedatives for people with insomnia. Most cases of insomnia that psychologists treat are known to be caused by psychological stress. This suggests that insomniacs do not need drugs that alter their biochemistry, but rather need psychotherapy to help them alleviate the stress causing their insomnia. Each of the following describes a flaw in the psychologist's reasoning EXCEPT: ['It presumes, without providing warrant, that insomnia contributes to an inability to cope with stress.', 'It overlooks the possibility that sedatives could help insomniacs cope with stress.', 'It neglects the possibility that for some people psychotherapy is a completely ineffective treatment for stress.', 'It fails to consider the possibility that sedatives are the only treatment known to be effective for cases of insomnia not caused by stress.']