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: Bob went to his friend's river house with his pet dog. Sentence 2: Everyone went out to the dock to sit in the water. Sentence 3: Bob had left his dog in the fenced-in backyard. Sentence 4: He thought he heard a splash nearby! Sentence 5: His dog had jumped the fence and was swimming toward him! Choices: a. New Sandals. b. Doggie Splash.

b