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: Bella wanted a dog. Sentence 2: Her mom agreed, as long as Bella cared for it all by herself. Sentence 3: Bella promised, so they went to the shelter and picked a dog for her. Sentence 4: Bella walked her dog every day, and cleaned and brushed him. Sentence 5: Bella's mom was proud of her daughter's responsibility! Choices: a. Braids. b. Dog.

b