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: Tim wanted to become a professional tennis player. Sentence 2: He began filming himself and watching it. Sentence 3: He compared his form to the professionals. Sentence 4: He then made adjustments in his own form. Sentence 5: He became a very good tennis player. Choices: a. Selling a Car. b. Professional Tennis.

b