Context: By the time I get home from those things my back hurts and my feet are so swollen . And they stay that wa throughout the next day . I had planned on going to the gym today but I ' m completely worn out . I hope I can muster up some energy , because my drink is with a particularly cheeky Brit and I have a feeling I 'll need to be on my toes .

Question: Why did my back hurt and my feet were so swollen that I could n't go to the gym after getting home from those things ?
Options:
0. I did so much work at my desk today that I over exerted myself .
1. None of the above choices .
2. I did a lot of work on my computer today and over exerted myself .
3. I did so much work on the phone today that I over exerted myself .
Answer: 1