Context: I was supposed to get a 100 calorie pack but had to eat half the bag of pretzels which is around 20 - 30 calories more . It 's hard to be sure the exact number of calories so i ' m a little bothered . I know the bag is 220 but i only had half so i m guessing 110 - 130 .

Question: Why was I supposed to get a 100 calorie pack ?
Options:
0. Because I had to eat half the bag .
1. None of the above choices .
2. Because half the bag of pretzels is around 20 - 30 calories more .
3. Because I 'm trying to lose weight .
Answer: 3