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: Allie was having a birthday party. Sentence 2: She decided to not invite Tina. Sentence 3: Tina got very mad. Sentence 4: So when Allie had her party, Tina was alone. Sentence 5: She wasn't amused. Choices: a. Forgetting the Gift. b. Birthday party.

b