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: Arthur did not want to go to school. Sentence 2: A bully was always being mean to him. Sentence 3: One day Arthur decided to stand up to the bully. Sentence 4: When the bully pushed him, he pushed back. Sentence 5: The bully was surprised and decided not to pick on him. Choices: a. The Bully. b. Cat wants to belong.

a