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: My son is just starting to walk. Sentence 2: He is still very wobbly on his feet. Sentence 3: It is really funny to watch him try. Sentence 4: He is getting there pretty quick, though. Sentence 5: He will be running soon. Choices: a. Rudy. b. My son.

b