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: Gina had a little sister who was not yet two years old. Sentence 2: The baby was just beginning to walk. Sentence 3: Gina was helping the baby to learn how to walk. Sentence 4: Gina showed the baby how to hold onto a big push toy while she walked. Sentence 5: The big push toy helped the baby to walk without falling down. Choices: a. The Baby's Toy. b. Ron Plays Guitar.

a