Context: About a month later , I shot up 20 lbs over a two week period . I was dieting and exercising at the time , so I checked my weight weekly . Nothing was wrong with the scale , I ' ve checked it elsewhere and everyone else in my house has used it and seen no changes .

Question: What may have caused you to gain 20 lbs ?
Options:
0. I stopped exercising at the time .
1. I ca n't determine the reason .
2. I messed up my diet .
3. Something was wrong wit the scale .
Answer: 1