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: The boy threw a ball. Sentence 2: The ball went across the street. Sentence 3: The boy chased the ball. Sentence 4: A car came down the street. Sentence 5: It stopped and waited for the boy to cross the street. Choices: a. Kids leave me speechless.. b. The Boy.

b