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: Roger Rumface was having a bad day. Sentence 2: His shipment from the gravel factory hadn't arrived. Sentence 3: He called up the gravel supervisor and asked him where it was. Sentence 4: The supervisor was evasive, and started yelling at Roger. Sentence 5: Roger yelled back, and lost his job. Choices: a. Test. b. Nails.

b