In this task, you're given four sentences of a story written in natural language. The given story is not complete and your job is to complete the story by selecting one of the sentence choices from (A) and (B), such that the story sounds fully coherent.

Let me give you an example: Sentence1: Rick grew up in a troubled household. Sentence2: He never found good support in family, and turned to gangs. Sentence3: It wasn't long before Rick got shot in a robbery. Sentence4: The incident caused him to turn a new leaf. 
 (A) He is happy now. (B) He joined a gang.
The answer to this example can be: A
Here is why: As mentioned in fourth sentence, the incident turned a new leaf to Rick's life; so, he must be happy now.

OK. solve this:
Sentence1: Yesterday I went to toys r us. Sentence2: I had to get gifts for my cousins. Sentence3: I loaded my cart up. Sentence4: Thankfully I found out they had a sale. 
 (A) I bought every mouse they had. (B) Because I'm a cheapskate it suited me well.
Answer:
B