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'.
Q: Sentence 1: Billy loved the rope swing. Sentence 2: It was one of his favorite things to do in the summer . Sentence 3: He would go down to the river and swing all day. Sentence 4: Today was one of those days. Sentence 5: He spent all day down there, swinging and having fun. Choices: a. Need to express oneself. b. The Rope Swing.
A:
b