The answer is option B "tell Diane's medical caregiver that he thinks Diane is suffering from postpartum depression." Postpartum depression is a type of depression mother following childbirth, and causes suicidal thoughts, mood swings, and lack of sleep.
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D. Because when you bite your nails your not in that type of mental state
C) Red Blood Cells
Red blood cells contains hemoglobin, which provide oxygen
