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 .

OPT:
a). I did so much work at my desk today that I over exerted myself ..
b). None of the above choices ..
c). I did a lot of work on my computer today and over exerted myself ..
d). I did so much work on the phone today that I over exerted myself ..
Q: 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 ?
b).