People with anorexia nervosa are often treated in a hospital because
a. they have generalized anxiety
b. their weight loss is extreme
c. their self-esteem is low
d. they have a chemical imbalance

(D) They have chemical imbalance.Explanation:

Anorexia nervosa often referred to simply as anorexia, is an eating dysfunction defined by low weight, the anxiety of increasing weight, and a great hope to be thin, occurring in food limitation. Several people with anorexia perceive themselves as overweight even though in actual they are underweight.

20 times a minute is usually the average respritory rate of an adult. additionally the patient is breathing on his own, is clearly maintaining his airway, and is intaking a sufficient amount of air. you shouldn't use a bag valve mask, cpap, or other form of positive pressure ventilation, unless the patient has lost control of his airway, and is not breathing (apneic) or has rapid breathing or slow and shallow respirations. this patient would most likely and should be put on an non-rebreather mask or nrb attached to 100% high flow oxygen at 15 l/min. don't use a nasal cannula, as the amount of oxygen it provides is limited with a rate of 6 l/min.