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'.

Sentence 1: Yesterday I was working very hard at work. Sentence 2: I was working so hard that I had lost track of time. Sentence 3: I worked right through my lunch break. Sentence 4: When I realized that, I was so hungry I couldn't work anymore. Sentence 5: I asked my boss to take a break and he said yes. Choices: a. Hard at work. b. Buying office supplies..
a