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: Kate was driving when she heard a weird noise. Sentence 2: The engine was knocking. Sentence 3: She was scared and took the car to a mechanic. Sentence 4: The mechanic found the problem and gave her a quote. Sentence 5: Kate agreed and got it fixed. Choices: a. Car Trouble. b. The book.

a