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.

[Q]: Title: The Sofa. Sentence 1: Bill lived in a small apartment with very little furniture. Sentence 2: He wanted to buy a new sofa but didn't know where to go. Sentence 3: He found an ad in the newspaper and called the store. Sentence 4: Bill headed down to the furniture place. Choices: a. So she decided to simply leave. b. He bought his new sofa and took it home that day.
[A]: b

[Q]: Title: Destroyed Engine. Sentence 1: Tom was at a quarter mile track. Sentence 2: He was going to race a friend. Sentence 3: He really wanted to win. Sentence 4: Tom decided to spray way too much nitrous. Choices: a. He won but it destroyed his engine. b. Everyone enjoyed the movie.
[A]: a

[Q]: Title: The puppets show.. Sentence 1: Cambria was playing at the library. Sentence 2: She noticed some puppet toys in one box. Sentence 3: She didn't understand how they worked so the librarian helped her. Sentence 4: Soon she was performing full puppet shows. Choices: a. The puppets were her favorite toy every time she visited the library. b. He and his friends had a great time.
[A]:
a