Part 1. Definition
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 end sentence choices from (A) and (B), such that the story does not sound complete and coherent, i.e., select an incorrect end sentence.
Part 2. 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.
Answer: B
Explanation: As mentioned in fourth sentence, the incident turned a new leaf to Rick's life; so, he must be happy now. Also, he was previously in gang, so, this incident cannot make him to join a gang. So, B is incorrect.
Part 3. Exercise
Sentence1: Carry has been short her whole life. Sentence2: She could never reach the top shelf at the store. Sentence3: Greg saw her struggling to reach. Sentence4: He went over and helped her. 
 (A) She refused his help and walked away. (B) They ended up going on a date that night.
Answer:
A