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: I bumped into an old neighbor today. Sentence 2: Siobhan lived in our building until this year. Sentence 3: She and her husband bought a house in Westford, MA. Sentence 4: She said she was having second thoughts about living in. Sentence 5: She found the suburbs boring and missed city life. Choices: a. Hope. b. Second Thoughts.

b