I was on the phone today talking to someone when I realized that I had not had any real human contact outside of say meeting with my advisor and running into someone from sociology since Monday . Its kinda scary how the days on the calendar just fall off that fast . I have n't really spoken to anyone in person that did n't have to do with my withdrawal or ordering food since Sunday .

Based on the preceding passage, choose your answer for question Why have n't you talked to anyone since Sunday ?
Pick from: I. None of the above choices . II. I had ran into people , but just no one outside of my advisor , or someone from sociology . III. I was so buried in my work , I have n't had a chance to talk to anyone . IV. I was on the phone today .
The answer is:
III.