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 dog wanted to go outside. Sentence 2: I was tired of the cold. Sentence 3: I opened the door and propped it open. Sentence 4: I let her go outside by herself. Sentence 5: She was perfectly contained by the fence, and I could sit and relax. Choices: a. Out. b. Roller Coaster.

a