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: Kate's mom had dropped her off at a friend's house. Sentence 2: Her mom was supposed to pick her up at 7. Sentence 3: At 8 Kate found out she couldn't come to get her. Sentence 4: It was too far for her to walk home. Sentence 5: A terrified Kate had no idea how she was going to get home. Choices: a. Terrible smell. b. No Pick Up.
b