Cheri has an overactive thyroid gland that sometimes causes her to have angry outbursts when she doesn't take her medication as prescribed. a therapist seeing cheri would attribute her anger to

A therapist seeing Cheri would attribute her anger to biological factors.
Her angry outbursts happen because of a malfunction in her body. Because her thyroid gland is overactive, this leads to her being angry from time to time if she doesn't take her medicine. Thus, these can only be biological factors, not social or psychological.