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: Sara had been dating Joe for 2 years. Sentence 2: She was sure he was going to propose to her. Sentence 3: One night he took her to the nicest restaurant. Sentence 4: While there, he asked her to marry him. Sentence 5: She said yes. Choices: a. Mountain trip. b. Wedding Proposal.

b