Given the task definition and input, reply with output. 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'.

Sentence 1: I want to start taking better care of things. Sentence 2: I went online looking for something to help. Sentence 3: I found a chore chart. Sentence 4: I purchased it for about thirty dollars. Sentence 5: It arrived in the mail yesterday. Choices: a. Zebra Exhibit. b. Chart.
b