You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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.

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.
Solution: A
Why? As mentioned in fourth sentence, the incident turned a new leaf to Rick's life; so, he must be happy now.

New input: Sentence1: My daughter had been begging for a pet. Sentence2: Her birthday was coming up. Sentence3: I visited the pet store to do some research. Sentence4: The workers helped me make a decision. 
 (A) They helped me realize that I should cut my hair short. (B) I bought her a dog.
Solution:
B