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: Spencer told me he wanted to be the best at this game. Sentence 2: I watched him practice harder and harder every day. Sentence 3: Eventually Spencer said that he was number two. Sentence 4: I got home one day and he was practicing harder than before. Sentence 5: Spencer hit number one that same day. Choices: a. Replacement. b. The Best.

b