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: Martin rolled up a piece of paper. Sentence 2: He threw it in the trash. Sentence 3: He missed the trashcan and it fell on the floor. Sentence 4: Martin went back to working. Sentence 5: A coworker handed him the paper and told him not to litter. Choices: a. Birthday Gift. b. Litter.

b