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: Otto went outside to discover that his car had been stolen. Sentence 2: Later that day he went to look for a new car to buy. Sentence 3: Otto found a car that he really liked. Sentence 4: The police called to tell Otto that they had found his old car. Sentence 5: Otto was disappointed that he couldn't buy the new car. Choices: a. Petting Zoo. b. Otto's Auto.

b