Given the task definition, example input & output, solve the new input case.
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.
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.
Output: A
As mentioned in fourth sentence, the incident turned a new leaf to Rick's life; so, he must be happy now.

New input case for you: Sentence1: Gina had detention. Sentence2: It was her first time. Sentence3: She talked with friends outside the room while pretending to be cool. Sentence4: Inside her stomach was turning in knots. 
 (A) Gina was natural rebel. (B) Gina was worried about her parents finding out.
Output:
B