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: I met my girlfriend two years ago. Sentence 2: We were both shopping for shoes at the mall. Sentence 3: I bumped into her in the shoe store. Sentence 4: We bumped into each other so hard we dropped the shoes we had. Sentence 5: What a crazy coincidence! Choices: a. Going to a baseball game. b. Meeting my girlfriend..

b