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: Everyone said that Jackie was half fish. Sentence 2: She spent more time in the water than on the ground. Sentence 3: Jackie wanted a pool, but her parents couldn't afford it. Sentence 4: So she joined the swim team and became eventually an olympic swimmer. Sentence 5: Now in her house, she has her own indoor heated pool. Choices: a. Engine Rebuild. b. Jackie's pool.
b