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: Yesterday was the first day of school. Sentence 2: A bus passed my house after picking up some kids just up the street. Sentence 3: Suddenly I saw a little boy running after the bus, trying to catch it. Sentence 4: The bus driver did not see the boy, so he did not stop the bus. Sentence 5: The boy stopped running, then started walking slowly down the street. Choices: a. Rain. b. The Boy Who Missed The Bus.

b