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: Will had a birthday coming up. Sentence 2: This was a big one - his thirtieth. Sentence 3: Will spent the day quietly hoping his friends would surprise him. Sentence 4: Will finished work and returned home, dejected. Sentence 5: Turning on the lights, Will was met with a surprise party! Choices: a. Newly pregnant. b. B-Day.

b