Given the task definition and input, reply with output. 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'.

Sentence 1: Samantha asked her parents if she could adopt a pet. Sentence 2: Her Mom and Dad agreed to adopt a kitten from the animal shelter. Sentence 3: Samantha was required to feed the cat and clean up after it each day. Sentence 4: She was very responsible and took great care of the cat. Sentence 5: Samantha's Mom and Dad were very proud of her. Choices: a. Mother's day. b. Adopt a Pet.
b