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: My mom said I could adopt a puppy for my birthday. Sentence 2: We went to the humane society. Sentence 3: There were a lot of dogs there. Sentence 4: I picked out a white puppy with brown spots. Sentence 5: We adopted the puppy and named him Brewster. Choices: a. Adopting a Puppy. b. Faithful.
a