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: Lisa found out she was pregnant. Sentence 2: She told her boyfriend of four months, Carter. Sentence 3: She expected Carter to leave her. Sentence 4: But to her surprise, Carter vowed to marry her. Sentence 5: Lisa was thrilled with her wonderful man! Choices: a. Proposal. b. Broken Ankle.

a