A 16-year-old student has been admitted to your psychiatric unit after fainting in physical education class. She has a diagnosis of anorexia nervosa, weighs 88 lb (40 kg), and is 5’4" (1.6 m) tall. She has been weighing herself several times per day at home and has lost 30 lb (13.5 kg) in the past 3 months. Which nursing diagnosis would be most appropriate for the client ？（）
A．Disturbed thought processes.
B．Impaired adjustment.
C．Imbalanced nutrition. Less than body requirements.
D．Ineffective sexuality patterns.