Given the task definition and input, reply with output. 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'.

Sentence 1: Tina paid for the bicycle and got her family ready. Sentence 2: It was a six man trolley style bicycle. Sentence 3: They climbed on board and started pedaling along the river trail. Sentence 4: Although Tina thought it was great fun, her family didn't agree. Sentence 5: Drenched in sweat and out of breath, the family returned the bike. Choices: a. Family Outing. b. Puncture repair kit.
a