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: A puppy named Princess was left alone for the day. Sentence 2: It was awfully quiet, with not a person to play with. Sentence 3: Her ears drooped to the side, and she curled up into a ball. Sentence 4: She thought she was alone until she heard a man call. Sentence 5: Excitedly, she jumped up and ran to her owner. Choices: a. Quiet. b. Fitting in.
a