Given the task definition and input, reply with output. 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: Steven was good at memorizing words really fast. Sentence 2: He challenged his friend to a word contest. Sentence 3: His friend Tony agreed. Sentence 4: Tony practiced very hard on his memorization word skills. Sentence 5: Tony was unable to beat Steven in the contest. Choices: a. The Fastest Bed Maker. b. Fastest Words.
b