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: Timothy walked through the park with his dog. Sentence 2: All of a sudden, his dog pulled on the leash. Sentence 3: Timothy fell, and the dog ran away. Sentence 4: Timothy looked for the next hour for his dog. Sentence 5: He finally found him humping a woman's leg. Choices: a. The Dog. b. Diver.

a