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: Kelsi and her sister Quinn were waiting after school. Sentence 2: Their mom was supposed to come and get them. Sentence 3: The girls were waiting for two hours. Sentence 4: No one came. Sentence 5: By the time they were picked up, it had been three hours. Choices: a. Nice shady spot. b. No one came.

b