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: THe pool had just been installed. Sentence 2: The friends were ready to swim. Sentence 3: It would feel so good on a hot day! Sentence 4: But when they arrived, they saw the water was brown. Sentence 5: THey'd have to wait another day. Choices: a. The Pool. b. Lucky Ball.

a