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: Sara loved playing tennis. Sentence 2: However, she needed help with her serve. Sentence 3: She decided to start taking lessons. Sentence 4: Her serve got better. Sentence 5: Sara began winning her matches. Choices: a. Cake. b. Tennis lessons.

b