Instructions: 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: Roller Skating. Sentence 1: Sarah went roller skating for the first time today. Sentence 2: Sarah strapped the roller skates to her feet. Sentence 3: Sarah stood up very slowly. Sentence 4: Her knees were shaking as she tried to balance herself. Choices: a. Sarah fell four times. b. In November, Erin casted her vote for president.
Output:
a