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: Bookshelf. Sentence 1: Spencer was moving. Sentence 2: He tried to lift the bookshelf. Sentence 3: The bookshelf fell down. Sentence 4: It broke all over. Choices: a. He walked back in because it was cold. b. Spencer bought a new one.
[A]: b

[Q]: Title: Piano Contest. Sentence 1: Tim decided to enter a piano contest. Sentence 2: There was a lot of stiff competition. Sentence 3: Tim played his little heart out. Sentence 4: The judges finally announced the winners. Choices: a. Tim won and took home the first place trophy. b. She left the room feeling great, like she had nailed it.
[A]: a

[Q]: Title: Good luck to the groom. Sentence 1: Mandy loved to go to karaoke. Sentence 2: For her hen party, her friends hired a karaoke machine. Sentence 3: She sang nearly every song on the machine. Sentence 4: Her friends got very bored after the first 5 songs. Choices: a. It made me feel proud of how brave I was in the face of giant insects. b. The important thing was that Mandy enjoyed her night.
[A]:
b