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: Greg was climbing a ladder to work on his roof. Sentence 2: He didn't realize that one of the spokes in the ladder had rotted. Sentence 3: When he stepped on it, his foot went clear through. Sentence 4: He caught himself just in time, just before almost falling. Sentence 5: Later that week, Greg bought a metal ladder to replace his. Choices: a. Ladder. b. Missionary.

a