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: The man collected bags. Sentence 2: He stored them all over his house. Sentence 3: His collection got really big. Sentence 4: The man bought a storage unit. Sentence 5: He moved all of his bag there. Choices: a. Grant becomes a dad. b. Collections.

b