Doctors in Britain have long suspected that patients who wear tinted eyeglasses are abnormally prone to depression and hypochondria. Psychological tests given there to hospital patients admitted for physical complaints like heart pain and digestive distress confirmed such a relationship. Perhaps people whose relationship to the world is psychologically painful choose such glasses to reduce visual stimulation, which is perceived as irritating. At any rate, it can be concluded that when such glasses are worn, it is because the wearer has a tendency to be depressed or hypochondriacal. The argument assumes which one of the following? ["For hypochondriacs wearing tinted glasses, the glasses serve as a visual signal to others that the wearer's health is delicate.", 'Depression is not caused in some cases by an organic condition of the body.', "The tinting does not dim light to the eye enough to depress the wearer's mood substantially.", 'Wearers do not think of the tinted glasses as a means of distancing themselves from other people.']