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: Calvin had worked at his job for thirty years. Sentence 2: He decided to retire from his job. Sentence 3: It was the last day of Calvin's job. Sentence 4: His co-workers threw him a farewell party. Sentence 5: Calvin left work and went home happy. Choices: a. The Retirement. b. Can't Move too Fast.

a