Given the task definition and input, reply with output. In this task, you're given five sentences, numbered 1 through 5, and two options a and b for possible titles for the story. Your job is to choose the title that better fits the story. Indicate your choice by 'a' or 'b'.

Sentence 1: Arlo came home angry one day. Sentence 2: He had gotten a rope jammed in the chain of his bike. Sentence 3: He showed this to his roommate Amelia. Sentence 4: Right away, Amelia figured out how to fix it. Sentence 5: Arlo was eternally grateful to Amelia after this. Choices: a. Taking Off the Shoes. b. Bike Jam.
b