Given the task definition and input, reply with output. 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.

Title: Sidewalk Crack. Sentence 1: Kelly was running down the street. Sentence 2: She tripped over a crack in the sidewalk and fell. Sentence 3: She broke her leg. Sentence 4: Her mom sued the city for the faulty sidewalk. Choices: a. She agreed and Jake was extremely happy. b. The city association covered all of Kelly's medical bills.
b