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: Bruce is on vacation. Sentence 2: He rents a beach house. Sentence 3: He has such an amazing time he wonders if it's for sale. Sentence 4: He calls the owner and asks if he can buy it. Sentence 5: The owner sells Bruce the beach house. Choices: a. Story of O. b. Bruce buys a beach house.
b