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: Norm riding his bicycle. Sentence 2: The chain came off the track. Sentence 3: His sister came over to help him. Sentence 4: They quickly put the chain on the track. Sentence 5: Norm was able to ride is bicycle again. Choices: a. Keeping Secrets. b. Biking.

b