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 sell things on eBay. Sentence 2: Recently a friend gave me box of old golfballs. Sentence 3: I left them in the hallway of my building for five minutes. Sentence 4: When I got back, I found the balls had been taken. Sentence 5: Now I never leave anything in the hallway. Choices: a. The Postponed Exam. b. Stolen Balls.

b