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: Owen was walking home late on his birthday. Sentence 2: He was really bummed because no one had called. Sentence 3: He sighed as he opened his apartment door. Sentence 4: Suddenly people burst out and yelled surprise. Sentence 5: He was so happy that his friends hadn't forgotten after all. Choices: a. Fighting with Mom. b. The Surprise Party.

b