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: Sam bought a new bolt for his door. Sentence 2: He had friends he trusted with keys. Sentence 3: Sam made copies at the nearby store. Sentence 4: He handed them out to his friends. Sentence 5: They all swore to take good care of them. Choices: a. Mowing the Lawn. b. Key Copies.

b