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: In 2007 our condo had mice. Sentence 2: We used traps and bait. Sentence 3: We killed some mice but more came. Sentence 4: Our property manager sealed every crack with foam. Sentence 5: That kept the mice out for four years. Choices: a. Fixing the Flag. b. Insulation.

b