Sally, age 19, reports to her doctor because she is feeling fatigued, unable to concentrate, irritable, cannot sleep well, and feels extremely tense, particularly in her back. She reports to the doctor that:

a) She might be experiencing symptoms of anxiety.
b) She is likely facing a physical health issue.
c) She is suffering from a sleep disorder.
d) She suspects it could be a symptom of a nutritional deficiency.