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: Line Up. Sentence 1: In the police line up, Mark was getting nervous. Sentence 2: He was guilty of the crime but trying not to show it. Sentence 3: When he was called to step forward he stumbled a little. Sentence 4: The witness from behind the glass was not paying attention though. Choices: a. He decided playing outside wasn't so bad after all. b. In the end, Mark was able to get away with his dastardly deed.
A:
b