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: Mark entered his work in the art fair. Sentence 2: The judges chose one piece to display in the main tent. Sentence 3: It attracted a big crowd. Sentence 4: Someone decided to buy it from Mark. Sentence 5: He made $10,000 on the one piece! Choices: a. The Art Fair. b. Sue.
a