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: Tom's power went out. Sentence 2: He called to find out why. Sentence 3: They told him he hadn't paid his bill. Sentence 4: Tom hadn't realized that was the case. Sentence 5: He paid it immediately and had the power restored. Choices: a. Late Bill. b. Baby.

a