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: The man put ketchup on his hamburger. Sentence 2: He put too much on. Sentence 3: He used some french fries to gather some ketchup. Sentence 4: He shoved them into his mouth. Sentence 5: Ketchup dripped down his chin. Choices: a. Charles Celebrates His Birthday. b. Ketchup.
b