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.

Ex Input:
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.

Ex Output:
b

Ex Input:
Title: Return Fire. Sentence 1: A couple of people gathered in the parking lot. Sentence 2: They ignited a few fireworks. Sentence 3: Dan had to reignite some of them. Sentence 4: However, he got burned by one of the sparks. Choices: a. The officer immediately arrested him. b. His mom took him to the hospital to get a few stitches.

Ex Output:
b

Ex Input:
Title: Small Mistake but Horrible Accident. Sentence 1: Ben was driving in the highway. Sentence 2: He tried to come to a stop. Sentence 3: His foot managed to get stuck on the petal. Sentence 4: He ran into the car in front of him. Choices: a. He was hurt for a while. b. Both vehicles landed in a lake.

Ex Output:
b