Definition: In this task, you're given the title of a five-sentence story, the first four sentences, and two options for the fifth sentence as a and b. Your job is to pick the sentence option that seamlessly connects with the rest of the story, indicating your choice as 'a' or 'b'. If both sentences are plausible, pick the one that makes more sense.
Input: Title: A Best Friend. Sentence 1: Joseph has always wanted a dog since he was little. Sentence 2: For the summer, he was to take care of his grandparent's dog. Sentence 3: He was able to play with Rover, their shepherd, on a daily basis. Sentence 4: Joseph was upset that he couldn't take Rover home with him. Choices: a. Jane looked outside her window, and saw the shooters being arrested. b. But as the summer ends, Joseph knew next year would return.
Output:
b