Definition: 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'.
Input: Sentence 1: Beth put the key in the ignition but the car didn't start. Sentence 2: The car battery was flat. Sentence 3: Beth panicked as she was going to be late for work. Sentence 4: She saw her son's small bike leaning against the wall. Sentence 5: Riding the bike with her knees around her ears she got to work on time. Choices: a. Rainy Day Deliveries. b. The flat battery..

b