W: Doctor, I haven't been able to get enough sleep lately, and I'm too tired to concentrate in class. M: Well, you know, spending too much time indoors with all that artificial lighting can do that to you. Your body loses track of whether it's day or night., Question: What does the man imply? (A) The woman is making too big a fuss about her condition. (B) Fatigue is a typical symptom of lack of exercise. (C) The woman should spend more time outdoors.
(C) The woman should spend more time outdoors.