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: I bought a new phone from the store. Sentence 2: The cashier handed the phone to me. Sentence 3: When I turned it on, it couldn't work. Sentence 4: The cashier investigated the the phone. Sentence 5: I've received a refund. Choices: a. Broken Upon Purchase. b. Angry Customer.

a