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: Florence kept all her old souvenirs in a white box in her closet. Sentence 2: From time to time she loved looking at it. Sentence 3: She sang old tunes while doing so. Sentence 4: But this time she stopped mid lyric. Sentence 5: She saw that her mom had hidden a letter there before dying. Choices: a. Cat at Night. b. Inside the white box.

b