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 Sister Fight. Sentence 1: Jessica was trying to chat with her boyfriend on the phone. Sentence 2: She could tell her little sister was spying through the door. Sentence 3: Quietly, she got up and walked to the door. Sentence 4: Then, she quickly opened it and kicked her sister. Choices: a. The two had a huge fight then, but luckily mom took Jessica's side. b. Then, he kicked Jack off of the bus for being unruly.
Output:
a