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: Due to the recent rains, the grass in my yard grew very tall. Sentence 2: My neighbor told me to cut it as it looked unsightly. Sentence 3: I refused, so he brought out his lawnmower and cut it for me. Sentence 4: Then he sent me a bill for $20 for the mowing job he did. Sentence 5: I refused to pay the bill. Choices: a. Long Wait. b. Neighbor.

b