Given the task definition and input, reply with output. 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: All of my friends are going out tonight. Sentence 2: They invited me to go with them. Sentence 3: I am feeling tired. Sentence 4: I think I may stay in for the night. Sentence 5: I let them know I would go next week instead. Choices: a. The night out. b. The fair.
a