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'.
Q: Sentence 1: Jack had an old toy box in his room. Sentence 2: He used to hide his favorite toys inside of it. Sentence 3: One day he decided to hide inside the toy box. Sentence 4: He became locked in the box and couldn't get out. Sentence 5: His mother was able to help him climb out of the toy box. Choices: a. retired. b. Toy Box.
A:
b