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: Anna had heard snow forecast that December day. Sentence 2: She rushed home from school, hoping to play in it. Sentence 3: Happily, the flakes began to flutter down around five PM. Sentence 4: Anna and her neighbors got to frolic in it for hours! Sentence 5: Then they went in for dinner, eager to warm up! Choices: a. First Snowfall. b. Fossils.

a