Roland took the kids shopping for school supplies . He came back miserable that he had spent $ 100 . The kids wanted these fancy binders , and mechanical pencils , and Gary wanted a little white board to write his assignments on . Then he just bought erasers and notebooks and stuff .
According to the above context, choose the best option to answer the following question.
Question: Why was Roland so upset ?
Options:
- Because the children had been hard to control while shopping
 - Because while they were shopping , the kids had been unruly
 - Because the kids had misbehaved in the store and knocked things over
 - Because he had n't anticipated the extent of his kid 's demands


Because he had n't anticipated the extent of his kid 's demands