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 had a heavy duty backpack. Sentence 2: It was so thick he did not like using it for small day trips. Sentence 3: Tom needed to purchase a new backpack. Sentence 4: .Tom purchased a smaller backpack. Sentence 5: Tom was very happy with his new and small backpack. Choices: a. Backpacks.. b. The Tackle Box.

a