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: Bill started a new school. Sentence 2: There was a bigger kid there named Bud. Sentence 3: Bud began bullying Bill right from the start. Sentence 4: Bill was scared but stood up to Bud. Sentence 5: Now the two boys are best friends. Choices: a. Bully. b. bat.

a