Read the following context and choose the best option to answer the question.
Context: 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 .
Question: Why was Roland so upset ?
Options: 
- Because while they were shopping , the kids had been unruly
 - Because the kids had misbehaved in the store and knocked things over
 - Because the children had been hard to control while shopping
 - Because he had not meant to spend so much


Because he had not meant to spend so much