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 liked a girl. Sentence 2: The boy asked the girl out. Sentence 3: The girl refused. Sentence 4: The boy persisted. Sentence 5: The girl got a restraining order. Choices: a. girl. b. New experiment.

a