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: Charles got ready for Halloween. Sentence 2: He went to the local costume shop and purchased a Halloween costume. Sentence 3: Charles then asked his parents if he could go trick or treating. Sentence 4: Charles parents agreed that he could go trick or treating on Halloween. Sentence 5: Charles went trick or treating on Halloween night. Choices: a. Charles goes trick or treating.. b. Bella the Rabbit.

a