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: Anna found a wallet in the school bathroom at school. Sentence 2: She realized that it had been put there by the girl in the next stall! Sentence 3: She grabbed it and ran. Sentence 4: But then she began feeling guilty. Sentence 5: Anna took the wallet right to the lost and found. Choices: a. Thief. b. The Tile.
a