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: David and Katie had been having problems. Sentence 2: Katie finally decided she'd had enough. Sentence 3: She told him to move his stuff out. Sentence 4: He got mad and broke her favorite vase. Sentence 5: Katie knew she'd made the right decision. Choices: a. Car Commercial. b. The Breakup.

b