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: Sean was trying to sleep. Sentence 2: His neighbors were playing loud music. Sentence 3: He tried to call the ask them to turn it down. Sentence 4: Nobody answered. Sentence 5: Sean was forced to ask them in person. Choices: a. Welcome surprise. b. Loud Music.
b